Initial implementation of virtual file system

Description

Initial implementation of virtual file system

This adds the minimum virtual file system support to start migrating
FileManager onto the VFS.

Originally discussed here:
http://lists.cs.uiuc.edu/pipermail/cfe-dev/2014-February/035188.html

Differential Revision: http://llvm-reviews.chandlerc.com/D2745

Details

Committed
benlangmuirFeb 18 2014, 4:10 PM
Differential Revision
D2745: Some infrastructure work for virtual file system (now on phab)
Parents
rL201617: Add missing test file for r201615
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