Convert JIT\Regression tests to merged test groups (#83895)

Remaining usability issues are listed in #71732

Conversion steps:
- static-none uses args - add comment to RequiresProcessIsolation
- remove unused arg in Runtime_80731.il
- Rewrite 4 IL tests to use newarr instead of args
- [cs-main] remove unused args in C# tests
- Update 9 tests with Main(args)
- Workaround: add RequiresProcessIsolation to LdfldaHack
- Move [Fact] to correct location in b12263
- In b06020, wrap $ class so that the C# wrapper can call it
- [ILTransform -public]
- [ILTransform -sr]
- Manually rename b598031/test and test2.
  These were missed by the previous ILTransform -n run.
  They no longer clash because run renamed all of their conflicts,
  but this renames them for consistency.
- [ILTransform -prociso] Rerun for new tests
- Wrappers
- [ILTransform -ilfact]
- Manually do missed -collapse-main-sig and fix placement of [Fact]
- Fix b89946 that referred to Main
- Fix Runtime_59444 reflection on Test*
* Fix TestSummary.cs to handle invalid XML characters
* [ILTransform -a]
* Manual fixes
* Update test groupings and add extern aliases
* Finish merge - incorporate changes to csproj/Dir.B.props - fix xunit.analyzers errors
* [ILTransform -public]
* [ILTransform -prociso]
* [ILTransform -ilfact] (undo GitHub_26491)
* Fix xUnit1003 in Runtime_83003
* Update new test Runtime_83941 for merged groups
* 59444 - Changing methods to internal broke reflection calls.  Use this
  opportunity to remove the reflection and simply mark the callees as [Fact]s.
- 64883/76273 - Suppress the xunit warning so that the code can continue
  using the normal (public-only) reflection search.
- Fix TestSummary.cs to handle invalid XML characters
- Add RequiresProcessIsolation for existing issues.target entry (AOT compiler fails)
- undo JIT/opt/And/Regressions/Regression1.csproj (possibly from manual merge from main)

src/tests/Common/XUnitWrapperLibrary/TestSummary.cs

@@ -5,6 +5,7 @@
 using System.IO;
 using System.Collections.Generic;
 using System.Text;
+using System.Xml;
 namespace XUnitWrapperLibrary;
 
 public class TestSummary
@@ -43,7 +44,7 @@ public string ToXmlString()
                               + $@" method=""{MethodName}"" time=""{Duration.TotalSeconds:F6}""");
 
             string outputElement = !string.IsNullOrWhiteSpace(Output)
-                                 ? $"<output><![CDATA[{Output}]]></output>"
+                                 ? $"<output><![CDATA[{XmlConvert.EncodeName(Output)}]]></output>"
                                  : string.Empty;
 
             if (Exception is not null)

src/tests/JIT/Regression/CLR-x86-EJIT/V1-M09.5-PDC/b12008/b12008.cs

@@ -3,23 +3,25 @@
 //
 
 using System;
+using Xunit;
 
 public class Bug
 {
-    public void Func(ref String str)
+    internal void Func(ref String str)
     {
         Console.WriteLine(str.ToString());
         str = "Abc";
     }
 
-    public void run()
+    internal void run()
     {
         String[] str = new String[10];
         str[0] = "DEF";
         Func(ref str[0]);
     }
 
-    public static int Main()
+    [Fact]
+    public static int TestEntryPoint()
     {
         (new Bug()).run();
         Console.WriteLine("Passed");

src/tests/JIT/Regression/CLR-x86-EJIT/V1-M09.5-PDC/b12008/b12008.csproj

@@ -1,6 +1,5 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <OutputType>Exe</OutputType>
     <CLRTestPriority>1</CLRTestPriority>
   </PropertyGroup>
   <PropertyGroup>

src/tests/JIT/Regression/CLR-x86-EJIT/V1-M09.5-PDC/b14426/b14426.cs

@@ -3,6 +3,7 @@
 
 using System;
 using System.Diagnostics;
+using Xunit;
 namespace SetIPTest
 {
     public class SetIP
@@ -13,7 +14,7 @@ public SetIP()
         }
 
 
-        public static void F()
+        internal static void F()
         {
             String s;
             double d;
@@ -53,7 +54,8 @@ public static void F()
         }
 
 
-        public static int Main()
+        [Fact]
+        public static int TestEntryPoint()
         {
             Console.WriteLine("Entering Main of SetIP");
 

src/tests/JIT/Regression/CLR-x86-EJIT/V1-M09.5-PDC/b14426/b14426.csproj

@@ -1,7 +1,4 @@
 <Project Sdk="Microsoft.NET.Sdk">
-  <PropertyGroup>
-    <OutputType>Exe</OutputType>
-  </PropertyGroup>
   <PropertyGroup>
     <!-- Set to 'Full' if the Debug? column is marked in the spreadsheet. Leave blank otherwise. -->
     <DebugType>PdbOnly</DebugType>

src/tests/JIT/Regression/CLR-x86-EJIT/V1-M09.5-PDC/b16935/b16935.il

@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -11,6 +12,9 @@
 .class public ILGEN_0x38e94b27 {
 
 .method public static int32 main() {
+.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+    01 00 00 00
+)
 .entrypoint
 .maxstack	10
 

src/tests/JIT/Regression/CLR-x86-EJIT/V1-M09.5-PDC/b16935/b16935.ilproj

@@ -1,6 +1,5 @@
 <Project Sdk="Microsoft.NET.Sdk.IL">
   <PropertyGroup>
-    <OutputType>Exe</OutputType>
     <CLRTestPriority>1</CLRTestPriority>
   </PropertyGroup>
   <PropertyGroup>

src/tests/JIT/Regression/CLR-x86-EJIT/V1-M11-Beta1/b40089/b40089.cs

@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 //
 
+using Xunit;
 namespace Test
 {
     using System;
@@ -13,7 +14,8 @@ public BB Method1(float param2)
             return new BB();
         }
 
-        public static int Main()
+        [Fact]
+        public static int TestEntryPoint()
         {
             new BB().Method1(0.0f);
             return 100;

src/tests/JIT/Regression/CLR-x86-EJIT/V1-M11-Beta1/b40089/b40089.csproj

@@ -1,6 +1,5 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <OutputType>Exe</OutputType>
     <CLRTestPriority>1</CLRTestPriority>
   </PropertyGroup>
   <PropertyGroup>

src/tests/JIT/Regression/CLR-x86-EJIT/V1-M11-Beta1/b40138/b40138.cs

@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 //
 
+using Xunit;
 namespace Test
 {
     using System;
@@ -15,7 +16,8 @@ BB Method3(float param2, ulong[] param3)
 
         static bool Static1(float[] param1) { return false; }
 
-        public static int Main()
+        [Fact]
+        public static int TestEntryPoint()
         {
             try
             {

src/tests/JIT/Regression/CLR-x86-EJIT/V1-M11-Beta1/b40138/b40138.csproj

@@ -1,6 +1,5 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <OutputType>Exe</OutputType>
     <CLRTestPriority>1</CLRTestPriority>
   </PropertyGroup>
   <PropertyGroup>

src/tests/JIT/Regression/CLR-x86-EJIT/V1-M11-Beta1/b44018/b44018.ilproj

@@ -1,6 +1,5 @@
 <Project Sdk="Microsoft.NET.Sdk.IL">
   <PropertyGroup>
-    <OutputType>Exe</OutputType>
     <CLRTestPriority>1</CLRTestPriority>
   </PropertyGroup>
   <PropertyGroup>

src/tests/JIT/Regression/CLR-x86-EJIT/V1-M11-Beta1/b45046/b45046.ilproj

@@ -1,6 +1,5 @@
 <Project Sdk="Microsoft.NET.Sdk.IL">
   <PropertyGroup>
-    <OutputType>Exe</OutputType>
     <CLRTestPriority>1</CLRTestPriority>
   </PropertyGroup>
   <PropertyGroup>

src/tests/JIT/Regression/CLR-x86-EJIT/V1-M11-Beta1/b45679/b45679.cs

@@ -2,13 +2,15 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 //
 
+using Xunit;
 namespace JitTest
 {
     using System;
 
     public class Test
     {
-        public static int Main()
+        [Fact]
+        public static int TestEntryPoint()
         {
             ulong a = 0x0000000000000020;
             ulong b = 0xa697fcbfd6d232d1;

src/tests/JIT/Regression/CLR-x86-EJIT/V1-M11-Beta1/b45679/b45679.csproj

@@ -1,7 +1,4 @@
 <Project Sdk="Microsoft.NET.Sdk">
-  <PropertyGroup>
-    <OutputType>Exe</OutputType>
-  </PropertyGroup>
   <PropertyGroup>
     <DebugType>PdbOnly</DebugType>
   </PropertyGroup>

src/tests/JIT/Regression/CLR-x86-EJIT/V1-M12-Beta2/b26323/b26323.ilproj

@@ -1,6 +1,5 @@
 <Project Sdk="Microsoft.NET.Sdk.IL">
   <PropertyGroup>
-    <OutputType>Exe</OutputType>
     <CLRTestPriority>1</CLRTestPriority>
   </PropertyGroup>
   <PropertyGroup>

src/tests/JIT/Regression/CLR-x86-EJIT/V1-M12-Beta2/b35455/b35455.ilproj

@@ -1,6 +1,5 @@
 <Project Sdk="Microsoft.NET.Sdk.IL">
   <PropertyGroup>
-    <OutputType>Exe</OutputType>
     <CLRTestPriority>1</CLRTestPriority>
   </PropertyGroup>
   <PropertyGroup>

src/tests/JIT/Regression/CLR-x86-EJIT/V1-M12-Beta2/b46847/b46847.cs

@@ -2,13 +2,15 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 //
 
+using Xunit;
 namespace Test
 {
     using System;
 
     public class App
     {
-        public static int Main()
+        [Fact]
+        public static int TestEntryPoint()
         {
             ulong a = 0x00000000005d909c;
             ulong b = 0x00004021bfa15862;

src/tests/JIT/Regression/CLR-x86-EJIT/V1-M12-Beta2/b46847/b46847.csproj

@@ -1,7 +1,4 @@
 <Project Sdk="Microsoft.NET.Sdk">
-  <PropertyGroup>
-    <OutputType>Exe</OutputType>
-  </PropertyGroup>
   <PropertyGroup>
     <DebugType>PdbOnly</DebugType>
   </PropertyGroup>

src/tests/JIT/Regression/CLR-x86-EJIT/V1-M12-Beta2/b47392/b47392.ilproj

@@ -1,6 +1,5 @@
 <Project Sdk="Microsoft.NET.Sdk.IL">
   <PropertyGroup>
-    <OutputType>Exe</OutputType>
     <RestorePackages>true</RestorePackages>
     <CLRTestPriority>1</CLRTestPriority>
   </PropertyGroup>

src/tests/JIT/Regression/CLR-x86-EJIT/v1-m10/b02353/b02353.cs

@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System;
+using Xunit;
 
 namespace DefaultNamespace
 {
@@ -135,7 +136,8 @@ public class Bug
         internal static readonly String[,] strArr = {{"This", " ", "a", " ", "test", " ", "of", " ", "patience", "."},
                                                                              {"This", " ", "a", " ", "test", " ", "of", " ", "patience", "."}};
 
-        public static int Main()
+        [Fact]
+        public static int TestEntryPoint()
         {
             new Bug();
             return 100;

src/tests/JIT/Regression/CLR-x86-EJIT/v1-m10/b02353/b02353.csproj

@@ -1,6 +1,5 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <OutputType>Exe</OutputType>
     <CLRTestPriority>1</CLRTestPriority>
   </PropertyGroup>
   <PropertyGroup>

src/tests/JIT/Regression/CLR-x86-EJIT/v1-m10/b07847/b07847.il

@@ -6,6 +6,7 @@
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
   .ver 4:0:0:0
 }
+.assembly extern xunit.core {}
 .assembly extern legacy library mscorlib {}
 .assembly b07847
 {
@@ -17,6 +18,9 @@
 	.field public static int32 TLSFieldData at FieldData
 	.method public static int32 main() 
 	{
+		.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+		    01 00 00 00
+		)
 		.entrypoint
 		ldsfld	int32 test::TLSFieldData  
 		ldc.i4  51966

src/tests/JIT/Regression/CLR-x86-EJIT/v1-m10/b07847/b07847.ilproj

@@ -1,6 +1,5 @@
 <Project Sdk="Microsoft.NET.Sdk.IL">
   <PropertyGroup>
-    <OutputType>Exe</OutputType>
     <CLRTestPriority>1</CLRTestPriority>
     <!-- Test relies on tls support see #2441 -->
     <DisableProjectBuild>true</DisableProjectBuild>

src/tests/JIT/Regression/CLR-x86-JIT/V1-M09.5-PDC/b06440/b06440a.il

@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -13,6 +14,9 @@
 .class public _simple {
 
 .method public static int32 main() {
+.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+    01 00 00 00
+)
 .entrypoint
 .maxstack	100
 

src/tests/JIT/Regression/CLR-x86-JIT/V1-M09.5-PDC/b06440/b06440a.ilproj

@@ -1,6 +1,5 @@
 <Project Sdk="Microsoft.NET.Sdk.IL">
   <PropertyGroup>
-    <OutputType>Exe</OutputType>
     <CLRTestPriority>1</CLRTestPriority>
   </PropertyGroup>
   <PropertyGroup>

src/tests/JIT/Regression/CLR-x86-JIT/V1-M09.5-PDC/b06440/b06440b.il

@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -13,6 +14,9 @@
 .class public _simple {
 
 .method public static int32 main() {
+.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+    01 00 00 00
+)
 .entrypoint
 .maxstack	100
 

src/tests/JIT/Regression/CLR-x86-JIT/V1-M09.5-PDC/b06440/b06440b.ilproj

@@ -1,6 +1,5 @@
 <Project Sdk="Microsoft.NET.Sdk.IL">
   <PropertyGroup>
-    <OutputType>Exe</OutputType>
     <CLRTestPriority>1</CLRTestPriority>
   </PropertyGroup>
   <PropertyGroup>

src/tests/JIT/Regression/CLR-x86-JIT/V1-M09.5-PDC/b06440/b06440c.il

@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -13,6 +14,9 @@
 .class public _simple {
 
 .method public static int32 main() {
+.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+    01 00 00 00
+)
 .entrypoint
 .maxstack	100
 

src/tests/JIT/Regression/CLR-x86-JIT/V1-M09.5-PDC/b06440/b06440c.ilproj

@@ -1,6 +1,5 @@
 <Project Sdk="Microsoft.NET.Sdk.IL">
   <PropertyGroup>
-    <OutputType>Exe</OutputType>
     <CLRTestPriority>1</CLRTestPriority>
   </PropertyGroup>
   <PropertyGroup>

src/tests/JIT/Regression/CLR-x86-JIT/V1-M09.5-PDC/b07341/b07341.il

@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 .assembly extern legacy library mscorlib {}
+.assembly extern xunit.core {}
 .assembly extern System.Console
 {
   .publickeytoken = (B0 3F 5F 7F 11 D5 0A 3A )
@@ -12,6 +13,9 @@
 .class public ExceptionTest {
 
 .method public static int32 main(){
+.custom instance void [xunit.core]Xunit.FactAttribute::.ctor() = (
+    01 00 00 00
+)
 .entrypoint
 L1:
   newobj instance void [mscorlib]System.Exception::.ctor() throw

src/tests/JIT/Regression/CLR-x86-JIT/V1-M09.5-PDC/b07341/b07341.ilproj

@@ -1,6 +1,5 @@
 <Project Sdk="Microsoft.NET.Sdk.IL">
   <PropertyGroup>
-    <OutputType>Exe</OutputType>
     <CLRTestPriority>1</CLRTestPriority>
   </PropertyGroup>
   <PropertyGroup>