Fix test/Concurrency/objc_async_protocol_irgen.swift for 32-bit
Fix test/Concurrency/objc_async_protocol_irgen.swift for 32-bit

This test was introduced without 32-bit testing.

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