stdlib: Fix the name mangling for UnsafeMutableRawPointer.storeBytes
stdlib: Fix the name mangling for UnsafeMutableRawPointer.storeBytes

The name mangling for storeBytes is missing `$`.

rdar://96062712

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