[PATCH] Fix isInstantiated and isInTemplateInstantiation to not recreate the matchers on each call.

[Samuel Benzaquen]

Hi klimek,

Store the result matcher after the first call and reuse it later on.
Recreating the matchers just to use them once incurs in a lot of
unnecessary temporary memory allocations.
This change speeds up our clang-tidy benchmarks by ~2%.

http://reviews.llvm.org/D6564

Files:
  include/clang/ASTMatchers/ASTMatchers.h
  include/clang/ASTMatchers/ASTMatchersInternal.h
  include/clang/ASTMatchers/ASTMatchersMacros.h
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