[PATCH] Adding 4 ASTMatchers: typedefDecl, isInMainFile, isInSystemFile, isInFileMatchingName

[Hendrik von Prince]

I updated it accordingly to the comments (thanks!).
One of the changes is the replacement of an initializer list through an explicit call to the default-constructor of std::vector<std::pair<std::string, std::string>>, to initialize the new introduced VirtualMappedFiles-parameter of the functions runToolOnCodeWithArgs and matchesConditionally. Due to the repeated usage of the type-declaration, it would be nice to declare a typedef for std::vector<std::pair<std::string, std::string>>, that could also be used for the RemappedFiles-instance-variable of the class PreprocessorOptions. 
If it is appropriate to add the typedef, where should I add it and how should I name it?

http://reviews.llvm.org/D4283

Files:
  include/clang/ASTMatchers/ASTMatchers.h
  include/clang/Tooling/Tooling.h
  lib/ASTMatchers/Dynamic/Registry.cpp
  lib/Tooling/Tooling.cpp
  unittests/ASTMatchers/ASTMatchersTest.cpp
  unittests/ASTMatchers/ASTMatchersTest.h
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