[PATCH] Refactor VariantMatcher to use a tagged union.

[Samuel Benzaquen]

  Updated the documentation. Replaced some "return NULL" with llvm_unreachable().

Hi klimek,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1446?vs=3597&id=3600#toc

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