[PATCH] D127379: [Lex] Keep track of skipped preprocessor blocks and advance the lexer directly if they are revisited

[Argyrios Kyrtzidis via Phabricator via cfe-commits]

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This speeds up preprocessing, specifically for preprocessing the clang sources time is reduced by about -36%,
using measurements on M1Pro with a release+thinLTO build.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D127379

Files:
  clang/include/clang/Lex/Preprocessor.h
  clang/lib/Lex/PPDirectives.cpp

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