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

[Jan Svoboda via Phabricator via cfe-commits]

jansvoboda11 added a comment.

Also I think we should mention this API in our docs, right where the removed original used to be.


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

https://reviews.llvm.org/D142196