[5.7] Add emission of Frontend parseable-output in WMO jobs. #58471
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Cherry-pick of #58422
Frontend emitting parsable output, as implemented, emitted began/finished messages on a per-primary basis. Which means that -frontend-parseable-output had no effect in contexts where no primary inputs are specified, such as WMO. This change fixes that by also emitting began/finished messages when no primary outputs are specified.
Resolves rdar://91999048