[PATCH] D123398: [VFS] RedirectingFileSystem only replace path if not already mapped

[Ben Barham via Phabricator via cfe-commits]

This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rGfe2478d44e4f: [VFS] RedirectingFileSystem only replace path if not already mapped (authored by bnbarham).

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D123398/new/

https://reviews.llvm.org/D123398

Files:
  clang/lib/Basic/FileManager.cpp
  clang/test/VFS/external-names-multi-overlay.c
  llvm/include/llvm/Support/VirtualFileSystem.h
  llvm/lib/Support/VirtualFileSystem.cpp
  llvm/unittests/Support/VirtualFileSystemTest.cpp

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