[PATCH] D19231: [ASTMatchers] Do not try to memoize nodes we can't compare.

[Samuel Benzaquen via cfe-commits]

sbenza created this revision.
sbenza added a reviewer: alexfh.
sbenza added a subscriber: cfe-commits.
Herald added a subscriber: klimek.

Prevent hasAncestor from comparing nodes that are not supported.
hasDescendant was fixed some time ago to avoid this problem.
I'm applying the same fix to hasAncestor: if any object in the Builder map is
not comparable, skip the cache.

http://reviews.llvm.org/D19231

Files:
  lib/ASTMatchers/ASTMatchFinder.cpp
  unittests/ASTMatchers/ASTMatchersTest.cpp

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