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Reland [Driver] Fix -working-directory issues

Authored by jkorous on Oct 15 2019, 10:51 AM.

Description

Reland [Driver] Fix -working-directory issues

Don't change the default VFS in Driver, update tests & reland.

This reverts commit 999f8a7416f8edc54ef92e715fd23c532bcc74d4.

llvm-svn: 374926