[Sema] CodeSynthesis: Extract logic to synthesize a parameter for memberwise `init`
[Sema] CodeSynthesis: Extract logic to synthesize a parameter for memberwise `init`

glessard/swift,benlangmuir/swift,glessard/swift,apple/swift,glessard/swift,roambotics/swift,benlangmuir/swift,benlangmuir/swift,roambotics/swift,benlangmuir/swift,apple/swift,apple/swift,roambotics/swift,roambotics/swift,benlangmuir/swift,benlangmuir/swift,apple/swift,apple/swift,roambotics/swift,apple/swift,glessard/swift,glessard/swift,glessard/swift,roambotics/swift