[PATCH] D150183: [Clang][clang-cl] Implement `__builtin_FUNCSIG`

[Jakub Mazurkiewicz via Phabricator via cfe-commits]

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This patch implements `__builtin_FUNCSIG` intrinsic which returns the same string as `__FUNCSIG__`.

Closes #58951.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D150183

Files:
  clang/docs/LanguageExtensions.rst
  clang/docs/ReleaseNotes.rst
  clang/include/clang/AST/Expr.h
  clang/include/clang/Basic/TokenKinds.def
  clang/include/clang/Sema/Sema.h
  clang/lib/AST/Expr.cpp
  clang/lib/Parse/ParseExpr.cpp
  clang/lib/Sema/SemaExpr.cpp
  clang/test/Preprocessor/feature_tests.c
  clang/test/Sema/source_location.c
  clang/test/SemaCXX/source_location.cpp

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