[CSSimplify] Ignore missing `makeIterator` member
[CSSimplify] Ignore missing `makeIterator` member

The actual issue in this cases is that the type of a sequence
doesn't conform to `Sequence` protocol.

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