[TypeChecker] Only type-check default initializer when computing property wrapper
[TypeChecker] Only type-check default initializer when computing property wrapper

Assert that if there is an initializer it is already type-checked.

atrick/swift,apple/swift,roambotics/swift,glessard/swift,ahoppen/swift,roambotics/swift,xwu/swift,benlangmuir/swift,apple/swift,ahoppen/swift,JGiola/swift,atrick/swift,xwu/swift,xwu/swift,JGiola/swift,apple/swift,benlangmuir/swift,gregomni/swift,rudkx/swift,apple/swift,rudkx/swift,benlangmuir/swift,xwu/swift,atrick/swift,glessard/swift,rudkx/swift,JGiola/swift,glessard/swift,xwu/swift,gregomni/swift,benlangmuir/swift,roambotics/swift,apple/swift,roambotics/swift,gregomni/swift,ahoppen/swift,ahoppen/swift,ahoppen/swift,roambotics/swift,atrick/swift,apple/swift,gregomni/swift,JGiola/swift,JGiola/swift,atrick/swift,benlangmuir/swift,roambotics/swift,glessard/swift,xwu/swift,glessard/swift,rudkx/swift,rudkx/swift,rudkx/swift,ahoppen/swift,gregomni/swift,gregomni/swift,xwu/swift,JGiola/swift,glessard/swift,atrick/swift,benlangmuir/swift