Benjamin Kramer 7708b2a4b6 [VFS] Add working directories to every virtual file system. ...

For RealFileSystem this is getcwd()/chdir(), the synthetic file systems can
make up one for themselves. OverlayFileSystem now synchronizes the working
directories when a new FS is added to the overlay or the overlay working
directory is set. This allows purely artificial file systems that have zero
ties to the underlying disks.

Differential Revision: http://reviews.llvm.org/D13430

llvm-svn: 249316

2015-10-05 13:55:20 +00:00

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