Ben Langmuir d51ba0b39f 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

2014-02-21 23:39:37 +00:00

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