Convert JIT/CodeGenBringUpTests to a merged test group (#85847)

See https://github.com/markples/utils/tree/for-PR-dotnet-runtime-85847-others for ILTransform tool.  As usual, I recommend viewing the commit list since it partitions the changes in a more readable way and paying more attention to manual changes.

* [ILTransform -public] Make test entrypoints accessible
* [ILTransform -ilfact] Main->TestEntryPoint, [Fact], remove OutputType=Exe
* Manual fixes for xUnit1013 - internal methods
* Add merged group
* Update porting-ryujit.md with info on merged test groups

Author: markples

docs/design/coreclr/jit/porting-ryujit.md

@@ -5,6 +5,7 @@
 
 using System;
 using System.Runtime.CompilerServices;
+using Xunit;
 public class BringUpTest_Add1
 {
     const int Pass = 100;
@@ -13,7 +14,8 @@ public class BringUpTest_Add1
     [MethodImplAttribute(MethodImplOptions.NoInlining)]
     public static int Add1(int x) { return x+1; }
 
-    public static int Main()
+    [Fact]
+    public static int TestEntryPoint()
     {
         int y = Add1(1);
         if (y == 2) return Pass;

src/tests/JIT/CodeGenBringUpTests/Add1.cs

@@ -1,6 +1,5 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <OutputType>Exe</OutputType>
     <CLRTestPriority>1</CLRTestPriority>
   </PropertyGroup>
   <PropertyGroup>

src/tests/JIT/CodeGenBringUpTests/Add1_d.csproj

@@ -1,6 +1,5 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <OutputType>Exe</OutputType>
     <CLRTestPriority>1</CLRTestPriority>
   </PropertyGroup>
   <PropertyGroup>

src/tests/JIT/CodeGenBringUpTests/Add1_do.csproj

@@ -1,6 +1,5 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <OutputType>Exe</OutputType>
     <CLRTestPriority>1</CLRTestPriority>
   </PropertyGroup>
   <PropertyGroup>

src/tests/JIT/CodeGenBringUpTests/Add1_r.csproj

@@ -1,6 +1,5 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <OutputType>Exe</OutputType>
     <CLRTestPriority>1</CLRTestPriority>
   </PropertyGroup>
   <PropertyGroup>

src/tests/JIT/CodeGenBringUpTests/Add1_ro.csproj

@@ -5,6 +5,7 @@
 
 using System;
 using System.Runtime.CompilerServices;
+using Xunit;
 public class BringUpTest_And1
 {
     const int Pass = 100;
@@ -13,7 +14,8 @@ public class BringUpTest_And1
     [MethodImplAttribute(MethodImplOptions.NoInlining)]
     public static int And1(int x) { return x & 1; }
 
-    public static int Main()
+    [Fact]
+    public static int TestEntryPoint()
     {
         int y = And1(17);
         if (y == 1) return Pass;

src/tests/JIT/CodeGenBringUpTests/And1.cs

@@ -1,6 +1,5 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <OutputType>Exe</OutputType>
     <CLRTestPriority>1</CLRTestPriority>
   </PropertyGroup>
   <PropertyGroup>

src/tests/JIT/CodeGenBringUpTests/And1_d.csproj

@@ -1,6 +1,5 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <OutputType>Exe</OutputType>
     <CLRTestPriority>1</CLRTestPriority>
   </PropertyGroup>
   <PropertyGroup>

src/tests/JIT/CodeGenBringUpTests/And1_do.csproj

@@ -1,6 +1,5 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <OutputType>Exe</OutputType>
     <CLRTestPriority>1</CLRTestPriority>
   </PropertyGroup>
   <PropertyGroup>