[PATCH] D125487: [Tooling/DependencyScanning] Refactor dependency scanning to produce pre-lexed preprocessor directive tokens, instead of minimized sources

[Argyrios Kyrtzidis via Phabricator via cfe-commits]

akyrtzi created this revision.
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Depends on D125486 <https://reviews.llvm.org/D125486>

This is 3/4 of a series of patches for making the special lexing for dependency scanning a first-class feature of the `Preprocessor` and `Lexer`.
This patch replaces the "source minimization" mechanism with a mechanism that produces lexed dependency directives tokens.

These directive tokens are not yet used by the preprocessor during dependency scanning, this will come in the following patch in the series.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D125487

Files:
  clang/include/clang/Lex/DependencyDirectivesScanner.h
  clang/include/clang/Lex/Lexer.h
  clang/include/clang/Tooling/DependencyScanning/DependencyScanningFilesystem.h
  clang/lib/Frontend/FrontendActions.cpp
  clang/lib/Lex/DependencyDirectivesScanner.cpp
  clang/lib/Lex/Lexer.cpp
  clang/lib/Tooling/DependencyScanning/DependencyScanningFilesystem.cpp
  clang/test/Lexer/minimize_source_to_dependency_directives_invalid_macro_name.c
  clang/test/Lexer/minimize_source_to_dependency_directives_pragmas.c
  clang/unittests/Lex/DependencyDirectivesScannerTest.cpp
  clang/unittests/Tooling/DependencyScannerTest.cpp

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