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

[Jonas Hahnfeld via Phabricator via cfe-commits]

Hahnfeld updated this revision to Diff 491095.
Hahnfeld added a comment.

Add unit test.


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

https://reviews.llvm.org/D142196

Files:
  clang/include/clang/Lex/PPCallbacks.h
  clang/lib/Lex/PPDirectives.cpp
  clang/unittests/Lex/PPCallbacksTest.cpp

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