[PATCH] First revision of the dynamic ASTMatcher library

[Samuel Benzaquen]

Hi klimek,

First revision of the dynamic ASTMatcher library.
This library supports all the features of the compile-time based ASTMatcher library, but allows the user to specify and construct the matchers at runtime.
It contains the following modules:
- A variant type, to be used by the matcher factory.
- A registry, where the matchers are indexed by name and have a factory method with a generic signature.
- A simple matcher expression parser, that can be used to convert a matcher expression string into actual matchers that can be used with the AST at runtime.

Many features where omitted from this first revision to simplify this code review. The main ideas are still represented in this change and it already has support working use cases.
Things that are missing:
- Support for polymorphic matchers. These requires supporting code in the registry, the marshallers and the variant type.
- Support for numbers, char and bool arguments to the matchers. This requires supporting code in the parser and the variant type.
- A command line program putting everything together and providing an already functional tool.

http://llvm-reviews.chandlerc.com/D714

Files:
  include/clang/ASTMatchers/ASTMatchersInternal.h
  include/clang/ASTMatchers/Dynamic/VariantValue.h
  include/clang/ASTMatchers/Dynamic/Registry.h
  include/clang/ASTMatchers/Dynamic/Parser.h
  unittests/ASTMatchers/CMakeLists.txt
  unittests/ASTMatchers/Makefile
  unittests/ASTMatchers/Dynamic/RegistryTest.cpp
  unittests/ASTMatchers/Dynamic/Makefile
  unittests/ASTMatchers/Dynamic/CMakeLists.txt
  unittests/ASTMatchers/Dynamic/ParserTest.cpp
  unittests/ASTMatchers/Dynamic/VariantValueTest.cpp
  lib/ASTMatchers/CMakeLists.txt
  lib/ASTMatchers/Makefile
  lib/ASTMatchers/Dynamic/Makefile
  lib/ASTMatchers/Dynamic/Parser.cpp
  lib/ASTMatchers/Dynamic/CMakeLists.txt
  lib/ASTMatchers/Dynamic/VariantValue.cpp
  lib/ASTMatchers/Dynamic/Marshallers.h
  lib/ASTMatchers/Dynamic/Registry.cpp
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