[PATCH] D58169: Reapply [VFS] Allow multiple RealFileSystem instances with independent CWDs.

[Sam McCall via Phabricator via llvm-commits]

sammccall created this revision.
sammccall added a reviewer: ilya-biryukov.
Herald added subscribers: llvm-commits, jdoerfert, kristina.
Herald added a project: LLVM.

This reverts commit r351091.
The original mac breakages are addressed by ensuring the root directory
we're working from is fully symlink-resolved before starting.


Repository:
  rL LLVM

https://reviews.llvm.org/D58169

Files:
  include/llvm/Support/VirtualFileSystem.h
  lib/Support/VirtualFileSystem.cpp
  unittests/Support/VirtualFileSystemTest.cpp

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