[PATCH] D149884: [clang][deps] Teach dep directive scanner about _Pragma

[Ben Langmuir via Phabricator via cfe-commits]

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While we cannot handle `_Pragma` used inside macros, we an handle this at the top level, and it some projects use the `_Pragma("once")` spelling like that, which was causing spurious failures in the scanner.

Limitations

- Cannot handle #define ONCE _Pragma("once"), same issue as using @import in a macro -- ideally we should diagnose this in obvious cases
- Our LangOpts are currently fixed, so we are not handling u"" strings or R"()" strings that require C11/C++11.

rdar://108629982


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D149884

Files:
  clang/include/clang/Lex/Pragma.h
  clang/lib/Lex/DependencyDirectivesScanner.cpp
  clang/lib/Lex/Pragma.cpp
  clang/test/ClangScanDeps/_Pragma-once.c
  clang/unittests/Lex/DependencyDirectivesScannerTest.cpp

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