[PATCH] D136036: [Clang] Add __has_builtin_constexpr support

[Evgeny Shulgin via Phabricator via cfe-commits]

Izaron created this revision.
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The `__has_builtin_constexpr` macro can be used to check
whether the builtin in constant-evaluated by Clang frontend.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D136036

Files:
  clang/include/clang/Basic/Builtins.def
  clang/include/clang/Basic/Builtins.h
  clang/include/clang/Lex/Preprocessor.h
  clang/lib/AST/ExprConstant.cpp
  clang/lib/Lex/PPMacroExpansion.cpp
  clang/test/Preprocessor/feature_tests.cpp

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