[PATCH] Filter the toplevel matchers by kind.

[Samuel Benzaquen]

Hi klimek,

Filter the toplevel matchers by kind.
Decl and Stmt matchers are tied to a specific node kind and trying to
match incompatible nodes is a waste.
Precalculate a filtered list of matchers that have a chance of matching
the node and ignore the rest.
Speeds up our clang-tidy benchmark by ~10%

http://reviews.llvm.org/D6361

Files:
  include/clang/AST/ASTTypeTraits.h
  include/clang/ASTMatchers/ASTMatchFinder.h
  include/clang/ASTMatchers/ASTMatchersInternal.h
  lib/ASTMatchers/ASTMatchFinder.cpp
  lib/ASTMatchers/ASTMatchersInternal.cpp
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