Add a test

src/tests/JIT/opt/Devirtualization/GitHub_50492.cs

@@ -0,0 +1,39 @@
+using System.Runtime.CompilerServices;
+using System.Threading;
+
+class Base
+{
+    public virtual int Test(Base b1, Base b2, bool p) => 0;
+
+    public virtual int Foo() => 1;
+}
+
+class ClassA : Base
+{
+    public override int Test(Base b1, Base b2, bool p) => p ? b2.Foo() : 42;
+}
+
+class ClassB : ClassA
+{
+    public override int Test(Base b1, Base b2, bool p) => b1.Test(b1, b2, p);
+}
+
+class Program
+{
+    public static int Main()
+    {
+        for (int i = 0; i < 100; i++)
+        {
+            // Make sure it doesn't assert, see https://github.com/dotnet/runtime/issues/50492
+            Test(new ClassB(), new ClassA(), new Base(), true);
+            Thread.Sleep(15);
+        }
+        return 100;
+    }
+
+    [MethodImpl(MethodImplOptions.NoInlining)]
+    static int Test(Base b0, Base b1, Base b2, bool p)
+    {
+        return b0.Test(b1, b2, p);
+    }
+}

src/tests/JIT/opt/Devirtualization/GitHub_50492.csproj

@@ -0,0 +1,9 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <Optimize>True</Optimize>
+  </PropertyGroup>
+  <ItemGroup>
+    <Compile Include="GitHub_50492.cs" />
+  </ItemGroup>
+</Project>