Add repro for dotnet/runtime#48179

Bug48179/Bug48179.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.30709.64
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Bug48179", "Bug48179\Bug48179.csproj", "{ECBFC915-4001-4ABF-AE41-494BF20BA639}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{ECBFC915-4001-4ABF-AE41-494BF20BA639}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{ECBFC915-4001-4ABF-AE41-494BF20BA639}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{ECBFC915-4001-4ABF-AE41-494BF20BA639}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{ECBFC915-4001-4ABF-AE41-494BF20BA639}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {A5ADCCFE-043A-4C65-921C-AA5496CF24AB}
+	EndGlobalSection
+EndGlobal

Bug48179/Bug48179/Bug48179.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net5.0</TargetFramework>
+    <ApplicationIcon />
+    <OutputType>Exe</OutputType>
+    <StartupObject />
+		<!--<WasmShellGenerateAOTProfile>true</WasmShellGenerateAOTProfile>-->
+		<WasmShellMonoRuntimeExecutionMode>FullAOT</WasmShellMonoRuntimeExecutionMode>
+		<!--<WasmShellMonoRuntimeExecutionMode>InterpreterAndAOT</WasmShellMonoRuntimeExecutionMode>-->
+		<WasmShellEnableEmccProfiling>true</WasmShellEnableEmccProfiling>
+		<!--<WasmShellDisableSDKCheckSumValidation>true</WasmShellDisableSDKCheckSumValidation>-->
+		<WasmShellEnableNetCoreICU>false</WasmShellEnableNetCoreICU>
+		<LangVersion>9.0</LangVersion>
+	</PropertyGroup>
+
+	<ItemGroup Condition="'$(WasmShellMonoRuntimeExecutionMode)'=='InterpreterAndAOT'">
+		<WasmShellEnableAotProfile Include="aot.profile" />
+	</ItemGroup>
+
+	<ItemGroup>
+		<LinkerDescriptor Include="Linker.xml" />
+	</ItemGroup>
+
+	<!--
+	<ItemGroup>
+		<WasmShellExtraEmccFlags Include="-fsanitize=address" />
+		<WasmShellExtraEmccFlags Include="-s TOTAL_MEMORY=393216000" />
+	</ItemGroup>
+	-->
+
+	<ItemGroup>
+		<PackageReference Include="Uno.Wasm.Bootstrap" Version="2.0.0-dev.163" />
+		<PackageReference Include="Uno.Wasm.Bootstrap.DevServer" Version="2.0.0-dev.163" />
+	</ItemGroup>
+</Project>

Bug48179/Bug48179/Linker.xml

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+<linker>
+	<assembly fullname="Bug48163"/>
+</linker>

Bug48179/Bug48179/Program.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Diagnostics;
+using System.Linq;
+using System.Runtime.CompilerServices;
+
+static class Program
+{
+	// const int outerCount = 1;
+	const int innerCount = 1;
+	const int maxDepth = 4;
+
+	static void Main(string[] args)
+	{
+		NestedLoopPerf_ForLoop();
+		NestedLoopPerf_ForEachLoop();
+	}
+
+	private static void NestedLoopPerf_ForLoop()
+	{
+		var list = Enumerable.Range(0, 10).ToList();
+
+		var r1 = Stopwatch.StartNew();
+		Bench(list);
+		r1.Stop();
+
+		Console.WriteLine($"r1={r1.Elapsed}");
+
+		static void Bench(List<int> array)
+		{
+			for (int i = 0; i < innerCount; i++)
+			{
+				Nest(0);
+			}
+
+			void Nest(int depth)
+			{
+				if(depth == maxDepth)
+				{
+					return;
+				}
+
+				for (int i = 0; i < array.Count; i++)
+				{
+					Nest(depth + 1);
+				}
+			}
+		}
+	}
+
+	private static void NestedLoopPerf_ForEachLoop()
+	{
+		var list = Enumerable.Range(0, 10).ToList();
+
+		var r1 = Stopwatch.StartNew();
+		Bench(list);
+		r1.Stop();
+
+		Console.WriteLine($"r1={r1.Elapsed}");
+
+		static void Bench(List<int> list)
+		{
+			for (int i = 0; i < innerCount; i++)
+			{
+				Nest(0);
+			}
+
+			void Nest(int depth)
+			{
+				if(depth == maxDepth)
+				{
+					return;
+				}
+
+				foreach(var item in list)
+				{
+					Nest(depth + 1);
+				}
+			}
+		}
+	}
+}
+

Bug48179/Bug48179/Properties/launchSettings.json

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+{
+  "iisSettings": {
+    "windowsAuthentication": false,
+    "anonymousAuthentication": true,
+    "iisExpress": {
+      "applicationUrl": "http://localhost:49943/",
+      "sslPort": 44344
+    }
+  },
+  "profiles": {
+    "IIS Express": {
+      "commandName": "IISExpress",
+      "launchBrowser": true,
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "Bug44269": {
+      "commandName": "Project",
+      "launchBrowser": true,
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      },
+      "applicationUrl": "http://localhost:5000"
+    }
+  }
+}

Bug48179/Bug48179/README.md

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+# Repro for issue https://github.com/dotnet/runtime/issues/48163
+
+Reproducing this requires .NET 5.0.101 or later, mono and ninja installed.
+
+Build with `dotnet build`