[PATCH] D66100: Add __has_builtin support for builtin function-like type traits.

[Richard Smith - zygoloid via Phabricator via cfe-commits]

rsmith created this revision.
rsmith added a reviewer: aaron.ballman.
Herald added subscribers: cfe-commits, kristina, jfb.
Herald added a project: clang.

Previously __has_builtin(__builtin_*) would return false for
__builtin_*s that we modeled as keywords rather than as functions
(because they take type arguments). With this patch, all builtins
that are called with function-call-like syntax return true from
__has_builtin (covering __builtin_* and also the __is_* and __has_* type
traits and the handful of similar builtins without such a prefix).

Update the documentation on __has_builtin and on type traits to match.
While doing this I noticed the type trait documentation was out of date
and incomplete; that's fixed here too.


Repository:
  rC Clang

https://reviews.llvm.org/D66100

Files:
  docs/LanguageExtensions.rst
  include/clang/Basic/Features.def
  include/clang/Basic/TokenKinds.def
  lib/Lex/PPMacroExpansion.cpp
  test/Preprocessor/feature_tests.c
  test/Preprocessor/feature_tests.cpp

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