[PATCH] D155858: Add a concept AST node.

[Haojian Wu via Phabricator via cfe-commits]

hokein added a subscriber: aaron.ballman.
hokein added a comment.

adding @aaron.ballman, who might have opinion on this.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D155858/new/

https://reviews.llvm.org/D155858