Add a VFSFromYAML class and a parser to create it
Provides a way to create a virtual file system using a YAML file that supports mapping a file to a path on an 'external' file system. The external file system will typically be the 'real' file system, but for testing it can be changed. A future patch will add a clang option to allow the user to specify such a file and overlay it, but for now this code is only exercised by the unit tests. Differential Revision: http://llvm-reviews.chandlerc.com/D2835 llvm-svn: 201905
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