[5.5] Produce an error when multiple -o
options are specified in multi-threading mode
#713
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5.5 Cherry-pick of #711
Causing the behavior to be analagous to the Legacy driver's here:
https://github.com/apple/swift/blob/main/lib/Driver/Driver.cpp#L2415
Otherwise, this isn't a supported flow and leads to driver crashes downstream.
Resolves rdar://79171618