[4.2] migrator: support migration of raw representable initializer calls without explicit labels. #17715
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Explanation: Some raw representable struct from SDK can be initialized without
explicit labels (rawValue:). When their types have been changed to type
alias, we should migrate the initializer calls to the argument alone.
Scope: Swift 4.2 migrator
Radar/SR Issue: rdar://41740103
Risk: Low
Testing: Unit tests added
Reviewer: Nathan Hawes