[PATCH] Refactor VariantMatcher::MatcherOps to reduce the amount of generated code.

[Samuel Benzaquen]

Hi klimek,

Refactor VariantMatcher::MatcherOps to reduce the amount of generated code.
 - Use a manually generated vtable instead of virtual method.
 - Make some code type agnostic and move it to the cpp file.
 - Return a void* instead of storing the object in MatcherOps. The
   caller already knows the real type.

This change reduces the number of symbols generated in Registry.cpp by
~18% and the compilation time (in non-release mode) by ~20%.

http://reviews.llvm.org/D5124

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