[Bootstrap] Add an extra argument to set a library path. #9118
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During Swift PR testing, we run the SwiftPM tests. Unfortunately, the SwiftPM tests always try to link with the system version of the Swift runtime libraries. This would be fine, except that Swift Testing has been built against the new runtimes and as a result has ended up referencing symbols from them that might not be present in the system runtime libraries.
To fix this, add an extra argument to allow us to add to the
DYLD_LIBRARY_PATH
setting SwiftPM uses to run its tests.rdar://160273124