[PATCH] Fix bug in DynTypedMatcher::constructVariadic() that would cause false negatives.

[Samuel Benzaquen]

Hi klimek,

DynTypedMatcher::constructVariadic() where the restrict kind of the
different matchers are not related causes the matcher to have a "None"
restrict kind. This causes false negatives for anyOf and eachOf.
Change the logic to get a common anscestor (or the newly added
'anything' kind) if the types are not related.
Also added regression tests that fail without the fix.

http://reviews.llvm.org/D5580

Files:
  include/clang/AST/ASTTypeTraits.h
  lib/AST/ASTTypeTraits.cpp
  lib/ASTMatchers/ASTMatchersInternal.cpp
  unittests/AST/ASTTypeTraitsTest.cpp
  unittests/ASTMatchers/ASTMatchersTest.cpp
  unittests/ASTMatchers/Dynamic/RegistryTest.cpp
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