Add regression test

src/tests/JIT/Regression/JitBlue/Runtime_84619/Runtime_84619.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using Xunit;
+
+// Generated by Fuzzlyn v1.5 on 2023-04-09 16:37:03
+// Run on X64 Windows
+// Seed: 6230188300048624105
+// Reduced from 155.1 KiB to 0.2 KiB in 00:01:48
+// Hits JIT assert in Release:
+// Assertion failed '((tree->gtFlags & GTF_VAR_DEF) == 0) && (tree->GetLclNum() == lclNum) && tree->gtVNPair.BothDefined()' in 'Program:Main(Fuzzlyn.ExecutionServer.IRuntime)' during 'VN based copy prop' (IL size 25; hash 0xade6b36b; FullOpts)
+// 
+//     File: D:\a\_work\1\s\src\coreclr\jit\copyprop.cpp Line: 161
+// 
+public class Runtime_84619
+{
+    public static sbyte s_27;
+    [Fact]
+    public static int TestEntryPoint()
+    {
+        long vr1 = 0;
+        for (int vr3 = 0; vr3 < -1; vr3++)
+        {
+            s_27 = (sbyte)(vr1 | vr1);
+        }
+        return 100;
+    }
+}

src/tests/JIT/Regression/JitBlue/Runtime_84619/Runtime_84619.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <Optimize>True</Optimize>
+    <DebugType>None</DebugType>
+  </PropertyGroup>
+  <ItemGroup>
+    <Compile Include="$(MSBuildProjectName).cs" />
+  </ItemGroup>
+</Project>