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

[Samuel Benzaquen]

  Added "Value not found" error.
  Added explicit conversion to bool on VariantValue. Replaced isNothing() with hasValue().

Hi pcc,

http://llvm-reviews.chandlerc.com/D3276

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D3276?vs=8338&id=8383#toc

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