[PATCH] Refactor Matcher<T> and DynTypedMatcher to reduce overhead of casts.

[Samuel Benzaquen]

Use a static_assert() instead of an enable_if<>.
We don't need to disable for overloading, and the default template argument is not supported on all platforms yet.

http://reviews.llvm.org/D5542

Files:
  include/clang/AST/ASTTypeTraits.h
  include/clang/ASTMatchers/ASTMatchersInternal.h
  lib/ASTMatchers/ASTMatchFinder.cpp
  lib/ASTMatchers/ASTMatchersInternal.cpp
  unittests/ASTMatchers/ASTMatchersTest.cpp
  unittests/ASTMatchers/Dynamic/ParserTest.cpp
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