Remove the second copy of ILLink.Shared project and source code (#83263)

I compared the two, the one in illink had a couple of small fixes on top of NativeAOT. The only change exclusive to NativeAOT was making the FlowAnnotations public, so I ported that over.

I chose to keep the one in illink. We can discuss moving it around in additional PR.

The rest of this change is solution and project file cleanup.

Co-authored-by: Adeel Mujahid <[email protected]>

Author: vitek-karas

src/coreclr/tools/aot/ILCompiler.Compiler/ILCompiler.Compiler.csproj

@@ -705,5 +705,5 @@
     </EmbeddedResource>
   </ItemGroup>
 
-  <Import Project="..\ILLink.Shared\ILLink.Shared.projitems" Label="Shared" />
+  <Import Project="..\..\..\..\tools\illink\src\ILLink.Shared\ILLink.Shared.projitems" Label="Shared" />
 </Project>

src/coreclr/tools/aot/ILCompiler.ReadyToRun/ILCompiler.ReadyToRun.csproj

@@ -128,16 +128,16 @@
     <Compile Include="..\..\Common\TypeSystem\Interop\InteropTypes.cs" Link="Interop\InteropTypes.cs" />
     <Compile Include="..\..\Common\TypeSystem\Interop\UnmanagedCallingConventions.cs" Link="Interop\UnmanagedCallingConventions.cs" />
     <Compile Include="..\ILCompiler.Reflection.ReadyToRun\PEReaderExtensions.cs" Link="Reflection\PEReaderExtensions.cs" />
-    <Compile Include="..\ILLink.Shared\ClosedAttribute.cs" Link="ILLink.Shared\ClosedAttribute.cs" />
-    <Compile Include="..\ILLink.Shared\ParameterIndex.cs" Link="ILLink.Shared\ParameterIndex.cs" />
-    <Compile Include="..\ILLink.Shared\TrimAnalysis\ReferenceKind.cs" Link="ILLink.Shared\TrimAnalysis\ReferenceKind.cs" />
-    <Compile Include="..\ILLink.Shared\TypeSystemProxy\GenericParameterProxy.cs" Link="ILLink.Shared\TypeSystemProxy\GenericParameterProxy.cs" />
-    <Compile Include="..\ILLink.Shared\TypeSystemProxy\IMemberProxy.cs" Link="ILLink.Shared\TypeSystemProxy\IMemberProxy.cs" />
-    <Compile Include="..\ILLink.Shared\TypeSystemProxy\MethodProxy.cs" Link="ILLink.Shared\TypeSystemProxy\MethodProxy.cs" />
-    <Compile Include="..\ILLink.Shared\TypeSystemProxy\ParameterCollection.cs" Link="ILLink.Shared\TypeSystemProxy\ParameterCollection.cs" />
-    <Compile Include="..\ILLink.Shared\TypeSystemProxy\ParameterProxy.cs" Link="ILLink.Shared\TypeSystemProxy\ParameterProxy.cs" />
-    <Compile Include="..\ILLink.Shared\TypeSystemProxy\TypeProxy.cs" Link="ILLink.Shared\TypeSystemProxy\TypeProxy.cs" />
-    <Compile Include="..\ILLink.Shared\TypeSystemProxy\WellKnownType.cs" Link="ILLink.Shared\TypeSystemProxy\WellKnownType.cs" />
+    <Compile Include="$(ToolsProjectRoot)illink\src\ILLink.Shared\ClosedAttribute.cs" Link="ILLink.Shared\ClosedAttribute.cs" />
+    <Compile Include="$(ToolsProjectRoot)illink\src\ILLink.Shared\ParameterIndex.cs" Link="ILLink.Shared\ParameterIndex.cs" />
+    <Compile Include="$(ToolsProjectRoot)illink\src\ILLink.Shared\TrimAnalysis\ReferenceKind.cs" Link="ILLink.Shared\TrimAnalysis\ReferenceKind.cs" />
+    <Compile Include="$(ToolsProjectRoot)illink\src\ILLink.Shared\TypeSystemProxy\GenericParameterProxy.cs" Link="ILLink.Shared\TypeSystemProxy\GenericParameterProxy.cs" />
+    <Compile Include="$(ToolsProjectRoot)illink\src\ILLink.Shared\TypeSystemProxy\IMemberProxy.cs" Link="ILLink.Shared\TypeSystemProxy\IMemberProxy.cs" />
+    <Compile Include="$(ToolsProjectRoot)illink\src\ILLink.Shared\TypeSystemProxy\MethodProxy.cs" Link="ILLink.Shared\TypeSystemProxy\MethodProxy.cs" />
+    <Compile Include="$(ToolsProjectRoot)illink\src\ILLink.Shared\TypeSystemProxy\ParameterCollection.cs" Link="ILLink.Shared\TypeSystemProxy\ParameterCollection.cs" />
+    <Compile Include="$(ToolsProjectRoot)illink\src\ILLink.Shared\TypeSystemProxy\ParameterProxy.cs" Link="ILLink.Shared\TypeSystemProxy\ParameterProxy.cs" />
+    <Compile Include="$(ToolsProjectRoot)illink\src\ILLink.Shared\TypeSystemProxy\TypeProxy.cs" Link="ILLink.Shared\TypeSystemProxy\TypeProxy.cs" />
+    <Compile Include="$(ToolsProjectRoot)illink\src\ILLink.Shared\TypeSystemProxy\WellKnownType.cs" Link="ILLink.Shared\TypeSystemProxy\WellKnownType.cs" />
     <Compile Include="Compiler\AssemblyExtensions.cs" />
     <Compile Include="Compiler\DependencyAnalysis\ReadyToRun\DeferredTillPhaseNode.cs" />
     <Compile Include="Compiler\DependencyAnalysis\ReadyToRun\ILBodyFixupSignature.cs" />