[PATCH] Refactor VariantMatcher to use an interface underneath.

[Samuel Benzaquen]

  Made the Payload be ref counted. They are const by design, so there is no problem sharing them.
  This change reduces copies and simplifies the implementation of VariantMatcher.

Hi klimek,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1446?vs=3630&id=3671#toc

BRANCH
  variant_matcher

ARCANIST PROJECT
  clang

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