[PATCH] Speed up hasName() matcher.

[Samuel Benzaquen]

Hi klimek,

Speed up hasName() matcher by skipping the expensive generation of the
fully qualified name unless we need it.
In the common case of matching an unqualified name, we don't need to
generate the full name. We might not even need to copy any string at
all.
This change speeds up our clang-tidy benchmark by ~10%

http://reviews.llvm.org/D5776

Files:
  include/clang/ASTMatchers/ASTMatchers.h
  include/clang/ASTMatchers/ASTMatchersInternal.h
  lib/ASTMatchers/ASTMatchersInternal.cpp
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