[PATCH] D133357: [Lex/DependencyDirectivesScanner] Keep track of the presence of tokens between the last scanned directive and EOF

[Argyrios Kyrtzidis via Phabricator via cfe-commits]

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Directive `dependency_directives_scan::tokens_present_before_eof` is introduced to indicate there were tokens present before
the last scanned dependency directive and EOF.
This is useful to ensure we correctly identify the macro guards when lexing using the dependency directives.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D133357

Files:
  clang/include/clang/Lex/DependencyDirectivesScanner.h
  clang/lib/Lex/DependencyDirectivesScanner.cpp
  clang/lib/Lex/Lexer.cpp
  clang/unittests/Lex/CMakeLists.txt
  clang/unittests/Lex/DependencyDirectivesScannerTest.cpp
  clang/unittests/Lex/PPDependencyDirectivesTest.cpp

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