JIT: Add a test around range check overflow (dotnet#100820)

Add a test that fails without the overflow check in range check.

Author: jakobbotsch

src/tests/JIT/opt/RangeChecks/Overflow.cs

@@ -0,0 +1,26 @@
+using System;
+using System.Runtime.CompilerServices;
+using Xunit;
+
+public class RangeCheck_Overflow
+{
+    [Fact]
+    public static int TestEntryPoint()
+    {
+        return Overflow([10, 0, 20, 0, 30, 0, 40]);
+    }
+
+    [MethodImpl(MethodImplOptions.NoInlining)]
+    private static int Overflow(Span<byte> a)
+    {
+        // CHECK: CORINFO_HELP_RNGCHKFAIL
+
+        int sum = 0;
+        for (int i = 0; i < a.Length; i += 2)
+        {
+            sum += a[i];
+        }
+
+        return sum;
+    }
+}

src/tests/JIT/opt/RangeChecks/Overflow.csproj

@@ -0,0 +1,16 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+  <DebugType>None</DebugType>
+    <Optimize>True</Optimize>
+    <!-- Needed for CLRTestEnvironmentVariable -->
+    <RequiresProcessIsolation>true</RequiresProcessIsolation>
+  </PropertyGroup>
+  <ItemGroup>
+    <Compile Include="$(MSBuildProjectName).cs">
+      <HasDisasmCheck>true</HasDisasmCheck>
+    </Compile>
+
+    <CLRTestEnvironmentVariable Include="DOTNET_TieredCompilation" Value="0" />
+    <CLRTestEnvironmentVariable Include="DOTNET_JITMinOpts" Value="0" />
+  </ItemGroup>
+</Project>