[PATCH] D142196: [clang][Lex] Add back PPCallbacks::FileNotFound

[Jonas Hahnfeld via Phabricator via cfe-commits]

Hahnfeld added a comment.

I checked a second time and couldn't find other API docs. I've now pushed this change for now (also to get it included in `release/16.x`), but please let me know for any follow-ups. Thanks!


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D142196/new/

https://reviews.llvm.org/D142196