[PATCH] Skip some unnecessary type checks.

[Samuel Benzaquen]

Hi klimek,

Skip some unnecessary type checks wrt DynTypedNodes.
Add DynTypedNode::getUnchecked() to skip the runtime check when the type
is known.
Speed up DynTypedNode::operator== by using isSame() instead of
isBaseOf().
Skip the type check in MatcherInterface<T>::matches(). All calls come
from DynTypedMatcher::matches(), which already did the type check.
This change speeds up our clang-tidy benchmark by ~4%.

http://reviews.llvm.org/D6468

Files:
  include/clang/AST/ASTTypeTraits.h
  include/clang/ASTMatchers/ASTMatchersInternal.h
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