[5.9] [clang] Fix ASTUnit working directory handling #7029
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Use `createPhysicalFileSystem` instead of `getRealFileSystem` to avoid affecting the process' current working directory, and set it at the top of `ASTUnit::LoadFromCommandLine` such that the driver used for argument parsing and the ASTUnit share the same VFS. This ensures that '-working-directory' correctly sets the VFS working directory in addition to the FileManager working directory.
Ensure we preserve the FileSystemOptions set on the FileManager when re-creating it (as `ASTUnit::Reparse` will clear the currently set FileManager). rdar://110697657
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@swift-ci please test |
hamishknight
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airspeedswift
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Jun 27, 2023
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5.9 cherry-pick of #7028