[PATCH] D125488: [Preprocessor] Make the special lexing for dependency scanning a first-class feature of the `Preprocessor` and `Lexer`

[Argyrios Kyrtzidis via Phabricator via cfe-commits]

akyrtzi added a comment.

Thank you @jansvoboda11 for reviewing and helping me qualify the changes! 🙇🏻‍♂️

If I receive no further comments I will commit the changes on Thursday; if anyone wants some more time to take a look just let me know.
I intend to commit in 2 commits, the first patch as one commit and the next three as a second commit; this is to ensure there's no commit where there's a performance regression in dependency scanning.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D125488/new/

https://reviews.llvm.org/D125488