[PATCH] [clang] Optimized ASTNodeKind::isBaseOf

[Alexander Kornienko]

Hi klimek,

ASTNodeKind::isBaseOf shows in one of the top lines of the profile when
running a large clang-tidy benchmark. This rewrite reduces its total time from
6.1% to 3.7%:
<     11.06s  6.14% 13.29%     11.06s  6.14%: clang::ast_type_traits::ASTNodeKind::isBaseOf
>      5.75s  3.70% 10.35%      5.75s  3.70%: clang::ast_type_traits::ASTNodeKind::isBaseOf

http://reviews.llvm.org/D5577

Files:
  .gitignore
  include/clang/AST/ASTTypeTraits.h
  lib/AST/ASTTypeTraits.cpp
  lib/ASTMatchers/Dynamic/VariantValue.cpp
  unittests/AST/ASTTypeTraitsTest.cpp
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