[PATCH] D87331: Sema: add support for `__attribute__((__swift_error__))`

[Saleem Abdulrasool via Phabricator via cfe-commits]

compnerd added a comment.

Discussed this with @aaron.ballman offline; he is okay with this since this is not going to permit incorrect code through without a diagnostic, even if it is not the most clear and the attribute wont be accidentally ignored.  We can add more diagnostics as a follow up if it is useful.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D87331/new/

https://reviews.llvm.org/D87331