core: map UnsignedLong to UInt32
core: map UnsignedLong to UInt32

Windows ARM64 is a LLP64 platform, which means that `unsigned long` is a
32-bit value.  This was already mapped properly for x86_64, but somehow
had missed ARM64.  This repairs that which is required for building the
standard library.

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