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

[Ben Barham via Phabricator via cfe-commits]

bnbarham added a comment.

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`.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D123103/new/

https://reviews.llvm.org/D123103

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