message: [SwiftLanguageRuntime] Add a comment to clarify what we're doing.
diff: @@ -2173,6 +2173,10 @@ bool SwiftLanguageRuntime::GetDynamicTypeAndAddress_GenericTypeParam(
  auto instance_type =
  remote_ast.getTypeForRemoteTypeMetadata(metadata_address,
  /*skipArtificial*/ true);
  +
  + // If we got this far, we know we already have a valid dynamic type
  + // in our hand. If RemoteAST gives us a different answer, update the
  + // type, otherwise return what we have.
  if (instance_type)
  class_type_or_name.SetCompilerType(
  {&scratch_ctx, instance_type.getValue().getPointer()});
  