[PATCH] Refactor VariantMatcher to use a tagged union.

[Samuel Benzaquen]

Hi klimek,

Refactor VariantMatcher to use a tagged union.
It supports "Single" and "Polymorphic". Will support more in the future.

http://llvm-reviews.chandlerc.com/D1446

Files:
  include/clang/ASTMatchers/Dynamic/VariantValue.h
  lib/ASTMatchers/Dynamic/VariantValue.cpp
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