[PATCH] D128947: [Lex] Introduce `PPCallbacks::LexedFileChanged()` preprocessor callback

[Argyrios Kyrtzidis via Phabricator via cfe-commits]

akyrtzi updated this revision to Diff 441551.
akyrtzi added a comment.

Use `Optional::value_or()`


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D128947/new/

https://reviews.llvm.org/D128947

Files:
  clang/include/clang/Basic/SourceManager.h
  clang/include/clang/Lex/PPCallbacks.h
  clang/lib/Basic/SourceManager.cpp
  clang/lib/Frontend/DependencyFile.cpp
  clang/lib/Lex/PPLexerChange.cpp

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