Steven Wu 23b42cf6c9 [CAS] Support legacy prefix map option ...

Bring back legacy prefix map option to allow an older swift-driver to
work with newer swift-frontend. For old swift-driver, it will always
send the old style prefix map option, so the new compiler needs to
support that.

rdar://164208526

2025-11-06 20:35:10 -08:00

175 KiB

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