Move Range and Index to Contracts source package (#78371)

Author: tmat

src/Compilers/Core/Portable/InternalUtilities/Index.cs renamed to src/Dependencies/Contracts/Index.cs

@@ -2,8 +2,16 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-#if !NETCOREAPP
+#if NET
+
+#pragma warning disable RS0016 // Add public types and members to the declared API (this is a supporting forwarder for an internal polyfill API)
+[assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Index))]
+#pragma warning restore RS0016 // Add public types and members to the declared API
+
+#else
+
 using System.Runtime.CompilerServices;
+
 namespace System
 {
     /// <summary>Represent a type can be used to index a collection either from the start or the end.</summary>

src/Dependencies/Contracts/Microsoft.CodeAnalysis.Contracts.projitems

@@ -25,6 +25,8 @@
     <Compile Include="$(MSBuildThisFileDirectory)RequiredMemberAttribute.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)SetsRequiredMembersAttribute.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)ExceptionUtilities.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Index.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Range.cs" />
   </ItemGroup>
   <ItemGroup Condition="'$(DefaultLanguageSourceExtension)' != '' AND '$(BuildingInsideVisualStudio)' != 'true'">
     <ExpectedCompile Include="$(MSBuildThisFileDirectory)**\*$(DefaultLanguageSourceExtension)" />

src/Compilers/Core/Portable/InternalUtilities/Range.cs renamed to src/Dependencies/Contracts/Range.cs

@@ -2,9 +2,15 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
-#if !NETCOREAPP
+#if NET
+
+#pragma warning disable RS0016 // Add public types and members to the declared API (this is a supporting forwarder for an internal polyfill API)
+[assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Range))]
+#pragma warning restore RS0016 // Add public types and members to the declared API
+
+#else
 using System.Runtime.CompilerServices;
-using Roslyn.Utilities;
+
 namespace System
 {
     /// <summary>Represent a range has start and end indexes.</summary>
@@ -46,9 +52,7 @@ value is Range r &&
 
         /// <summary>Returns the hash code for this instance.</summary>
         public override int GetHashCode()
-        {
-            return Hash.Combine(Start.GetHashCode(), End.GetHashCode());
-        }
+            => unchecked(Start.GetHashCode() * (int)0xA5555529 + End.GetHashCode());
 
         /// <summary>Converts the value of the current Range object to its equivalent string representation.</summary>
         public override string ToString()

src/Tools/SemanticSearch/BuildTask/SemanticSearch.BuildTask.csproj

@@ -16,10 +16,5 @@
   <ItemGroup>
     <InternalsVisibleTo Include="SemanticSearch.BuildTask.UnitTests" />
   </ItemGroup>
-  <ItemGroup>
-    <Compile Include="..\..\..\Compilers\Core\Portable\InternalUtilities\Range.cs" Link="Utilities\Range.cs" />
-    <Compile Include="..\..\..\Compilers\Core\Portable\InternalUtilities\Index.cs" Link="Utilities\Index.cs" />
-    <Compile Include="..\..\..\Compilers\Core\Portable\InternalUtilities\Hash.cs" Link="Utilities\Hash.cs" />
-  </ItemGroup>
   <Import Project="..\..\..\Dependencies\Contracts\Microsoft.CodeAnalysis.Contracts.projitems" Label="Shared" />
 </Project>

src/Workspaces/SharedUtilitiesAndExtensions/Compiler/Core/CompilerExtensions.projitems

@@ -113,9 +113,6 @@
     <Compile Include="$(MSBuildThisFileDirectory)..\..\..\..\Compilers\Core\Portable\InternalUtilities\ImmutableListExtensions.cs">
       <Link>InternalUtilities\ImmutableListExtensions.cs</Link>
     </Compile>
-    <Compile Include="$(MSBuildThisFileDirectory)..\..\..\..\Compilers\Core\Portable\InternalUtilities\Index.cs">
-      <Link>InternalUtilities\Index.cs</Link>
-    </Compile>
     <Compile Include="$(MSBuildThisFileDirectory)..\..\..\..\Compilers\Core\Portable\InternalUtilities\ISetExtensions.cs">
       <Link>InternalUtilities\ISetExtensions.cs</Link>
     </Compile>
@@ -140,9 +137,6 @@
     <Compile Include="$(MSBuildThisFileDirectory)..\..\..\..\Compilers\Core\Portable\InternalUtilities\PlatformInformation.cs">
       <Link>InternalUtilities\PlatformInformation.cs</Link>
     </Compile>
-    <Compile Include="$(MSBuildThisFileDirectory)..\..\..\..\Compilers\Core\Portable\InternalUtilities\Range.cs">
-      <Link>InternalUtilities\Range.cs</Link>
-    </Compile>
     <Compile Include="$(MSBuildThisFileDirectory)..\..\..\..\Compilers\Core\Portable\InternalUtilities\ReaderWriterLockSlimExtensions.cs">
       <Link>InternalUtilities\ReaderWriterLockSlimExtensions.cs</Link>
     </Compile>