JIT: Fix bug in finally cloning caused by unsound callfinally reordering

Port of #18348 to release/2.1

We need to make sure that if we reorder a callfinally during finally cloning
that the callfinally is actually the one being targeted by the last block in
the try range.

Closes #18332. Linked issue has some more detailed notes.

2 files changed, 90 insertions, 0 deletions

diff --git a/tests/src/JIT/Regression/JitBlue/GitHub_18332/GitHub_18332.cs b/tests/src/JIT/Regression/JitBlue/GitHub_18332/GitHub_18332.cs
new file mode 100644
index 0000000000..57d6239d44
--- /dev/null
+++ b/tests/src/JIT/Regression/JitBlue/GitHub_18332/GitHub_18332.cs
@@ -0,0 +1,56 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Collections.Generic;
+
+internal class Foo : IDisposable
+{
+    public void Dispose()
+    {
+    }
+}
+
+class GitHub_18332
+{
+    // In Aargh there is a finally with two distinct exit paths.
+    // Finally cloning may choose the non-fall through ("wibble") exit
+    // path to clone, and then will try to incorrectly arrange for
+    // that path to become the fall through.
+    public static string Aargh()
+    {
+        using (var foo = new Foo())
+        {
+            foreach (var i in new List<int>())
+            {
+                try
+                {
+                    Console.WriteLine("here");
+                }
+                catch (Exception)
+                {
+                    return "wibble";
+                }
+            }
+            
+            foreach (var i in new List<int>())
+            {
+            }
+        }
+        
+        return "wobble";
+    }
+    
+    public static int Main(string[] args)
+    {
+        string expected = "wobble";
+        string actual = Aargh();
+        if (actual != expected)
+        {
+            Console.WriteLine($"FAIL: Aargh() returns '{actual}' expected '{expected}'");
+            return 0;
+        }
+        return 100;
+    }
+}
diff --git a/tests/src/JIT/Regression/JitBlue/GitHub_18332/GitHub_18332.csproj b/tests/src/JIT/Regression/JitBlue/GitHub_18332/GitHub_18332.csproj
new file mode 100644
index 0000000000..c776f7dd22
--- /dev/null
+++ b/tests/src/JIT/Regression/JitBlue/GitHub_18332/GitHub_18332.csproj
@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <AssemblyName>$(MSBuildProjectName)</AssemblyName>
+    <SchemaVersion>2.0</SchemaVersion>
+    <ProjectGuid>{95DFC527-4DC1-495E-97D7-E94EE1F7140D}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <ProjectTypeGuids>{786C830F-07A1-408B-BD7F-6EE04809D6DB};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <SolutionDir Condition="$(SolutionDir) == '' Or $(SolutionDir) == '*Undefined*'">..\..\</SolutionDir>
+  </PropertyGroup>
+  <!-- Default configurations to help VS understand the configurations -->
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' "></PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' "></PropertyGroup>
+  <ItemGroup>
+    <CodeAnalysisDependentAssemblyPaths Condition=" '$(VS100COMNTOOLS)' != '' " Include="$(VS100COMNTOOLS)..\IDE\PrivateAssemblies">
+      <Visible>False</Visible>
+    </CodeAnalysisDependentAssemblyPaths>
+  </ItemGroup>
+  <PropertyGroup>
+    <DebugType></DebugType>
+    <Optimize>True</Optimize>
+  </PropertyGroup>
+  <ItemGroup>
+    <Compile Include="GitHub_18332.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <Service Include="{82A7F48D-3B50-4B1E-B82E-3ADA8210C358}" />
+  </ItemGroup>
+  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.targets))\dir.targets" />
+  <PropertyGroup Condition=" '$(MsBuildProjectDirOverride)' != '' "></PropertyGroup>
+</Project>
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