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

[Samuel Benzaquen]

================
Comment at: lib/ASTMatchers/ASTMatchersInternal.cpp:95-96
@@ +94,4 @@
+  DynTypedMatcher Result = InnerMatchers[0];
+  // Use the least derived type as the restriction for the wrapper.
+  // This allows mismatch to be resolved on the inner matchers.
+  for (const DynTypedMatcher &M : InnerMatchers) {
----------------
klimek wrote:
> "mismatches" or "a mismatch"?
Fixed.

http://reviews.llvm.org/D5485