Reject pregenerating p/invokes for LCIDConversion

src/coreclr/src/tools/crossgen2/ILCompiler.ReadyToRun/IL/Stubs/PInvokeILEmitter.cs

@@ -79,6 +79,9 @@ private MethodIL EmitIL()
             if (!_importMetadata.Flags.PreserveSig)
                 throw new NotSupportedException();
 
+            if (_targetMethod.HasCustomAttribute("System.Runtime.InteropServices", "LCIDConversionAttribute"))
+                throw new NotSupportedException();
+
             PInvokeILCodeStreams pInvokeILCodeStreams = new PInvokeILCodeStreams();
             ILEmitter emitter = pInvokeILCodeStreams.Emitter;
             ILCodeStream marshallingCodestream = pInvokeILCodeStreams.MarshallingCodeStream;