[PATCH] D123103: Revert "[VFS] RedirectingFileSystem only replace path if not already mapped"

[Duncan P. N. Exon Smith via Phabricator via cfe-commits]

dexonsmith accepted this revision.
dexonsmith added a comment.
This revision is now accepted and ready to land.

In D123103#3428298 <https://reviews.llvm.org/D123103#3428298>, @bnbarham wrote:

> This broke crash reproducers in very specific circumstances, see https://reviews.llvm.org/D123104. I'll re-commit with adding `ExposesExternalVFSPath` instead of replacing `IsVFSMapped`.

Please expand the commit message to include some details (such as these) so git-log is more useful. With that, LGTM.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D123103/new/

https://reviews.llvm.org/D123103