[PATCH] Special case 0 and 1 matcher in makeAllOfComposite().

[Samuel Benzaquen]

Hi klimek,

Remove unnecessary wrapping for the 0 and 1 matcher cases of
makeAllOfComposite(). We don't need a variadic wrapper for those cases.
Refactor TrueMatcher to take advandage of the new conversions between
DynTypedMatcher and Matcher<T>. Also, make it a singleton.
This change improves our clang-tidy related benchmarks by ~12%.

http://reviews.llvm.org/D5675

Files:
  include/clang/ASTMatchers/ASTMatchers.h
  include/clang/ASTMatchers/ASTMatchersInternal.h
  lib/ASTMatchers/ASTMatchersInternal.cpp
  unittests/ASTMatchers/Dynamic/ParserTest.cpp
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