Revert r361885 "[Driver] Fix -working-directory issues"
This made clang unable to open files using relative paths on network shares on
Windows (PR43204). On the bug it was pointed out that createPhysicalFileSystem()
is not terribly mature, and using it is risky. Reverting for now until there's
a clear way forward.
Currently the -working-directory option does not actually impact the working
directory for all of the clang driver, it only impacts how files are looked up
to make sure they exist. This means that that clang passes the wrong paths
to -fdebug-compilation-dir and -coverage-notes-file.
This patch fixes that by changing all the places in the driver where we convert
to absolute paths to use the VFS, and then calling setCurrentWorkingDirectory on
the VFS. This also changes the default VFS for Driver to use a virtualized
working directory, instead of changing the process's working directory.
Differential Revision: https://reviews.llvm.org/D62271
This also revertes the part of r369938 which checked that -working-directory works.