[PATCH] D42768: AST: add an extension to support SwiftCC on MS ABI

[Saleem Abdulrasool via Phabricator via cfe-commits]

compnerd added a comment.

@rjmccall I think both of those are concerns.  I'm just putting this up so that others can grab and test it.  It also coincides with the approach that we have taken elsewhere in clang using the `__clang` namespace for extending the decoration.  What is the case that I am not considering?  I think that we should try to handle this as appropriately as possible.  The only case that should cause a failure is if the user explicitly uses the `__Swift::__swift_cc` namespace.


Repository:
  rC Clang

https://reviews.llvm.org/D42768