[next] Add Default argument for hasFlag
[next] Add Default argument for hasFlag

llvm/llvm-project removed the default for the `Default` argument in
522712e2d241ea33575a9c7a60ad582634f04f0d. Specify it directly in the
call to `hasFlag`.

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