[PATCH] D149173: [llvm][vfs] Avoid silent fallback to process-wide working directory

[Ben Langmuir via Phabricator via llvm-commits]

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In createPhysicalFileSystem, preserve the per-instance working directory, even after the first call to getcwd fails.

rdar://108213753


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D149173

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

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