[PATCH] D112088: [clang][deps] Keep #pragma push_macro, pop_macro and include_alias when minimizing source code.

[Sylvain Audi via Phabricator via cfe-commits]

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The `#pragma` directives `push_macro`/`pop_macro` and `include_alias` may influence the `#include` / `import` directives encountered by dependency scanning tools like `clang-scan-deps`.

This patch ensures that those directives are not removed during source code minimization.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D112088

Files:
  clang/include/clang/Lex/DependencyDirectivesSourceMinimizer.h
  clang/lib/Lex/DependencyDirectivesSourceMinimizer.cpp
  clang/test/ClangScanDeps/Inputs/preprocess_minimized_pragmas.h
  clang/test/ClangScanDeps/Inputs/preprocess_minimized_pragmas_cdb.json
  clang/test/ClangScanDeps/preprocess_minimized_pragmas.cpp
  clang/test/Lexer/minimize_source_to_dependency_directives_pragmas.c
  clang/unittests/Lex/DependencyDirectivesSourceMinimizerTest.cpp

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