[PATCH] D46940: [ASTImporter] make sure that ACtx::getParents still works

[Aaron Ballman via Phabricator via cfe-commits]

aaron.ballman added a reviewer: rsmith.
aaron.ballman added a comment.

Adding Richard as he has more background in this area. In general, I think it's okay - if we invalidate too often, we do lose some performance, but the correctness should still be there. I'll let Richard provide the final sign-off, however.


https://reviews.llvm.org/D46940