[PATCH] Add support for named values in the parser.

[Samuel Benzaquen]

Hi klimek, pcc,

Add support for named values in the parser.
This allows injection of arbitrary constants using a custom Sema object.
Completions are not supported right now.

Will be used by clang_query to support the 'let' command.
Usage example:
  clang_query> let unique_ptr recordDecl(hasName("unique_ptr"))
  clang_query> match varDecl(hasType(unique_ptr))

http://llvm-reviews.chandlerc.com/D3229

Files:
  include/clang/ASTMatchers/Dynamic/Parser.h
  include/clang/ASTMatchers/Dynamic/VariantValue.h
  lib/ASTMatchers/Dynamic/Parser.cpp
  unittests/ASTMatchers/Dynamic/ParserTest.cpp
  unittests/ASTMatchers/Dynamic/VariantValueTest.cpp
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