Fix single method compilation for shared methods (dotnet#80864)

Consider canonical forms of the single method to also be contained in the compilation.

This ensures the scanner scans the method (and builds generic dictionaries, etc).

src/coreclr/tools/aot/ILCompiler.Compiler/Compiler/SingleMethodCompilationModuleGroup.cs

@@ -30,7 +30,7 @@ public override bool IsSingleFileCompilation
 
         public override bool ContainsMethodBody(MethodDesc method, bool unboxingStub)
         {
-            return method == _method;
+            return method == _method || method == _method.GetCanonMethodTarget(CanonicalFormKind.Specific);
         }
 
         public sealed override bool ContainsMethodDictionary(MethodDesc method)