[PATCH] Fix segfault in hasDeclContext for nodes that have no decl context.

[Samuel Benzaquen]

Hi klimek,

Some declarations do not have a declaration context, like TranslationUnitDecl.
Fix hasDeclContext() to not segfault on these nodes.

http://reviews.llvm.org/D6003

Files:
  include/clang/ASTMatchers/ASTMatchers.h
  unittests/ASTMatchers/ASTMatchersTest.cpp
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