Update the correct size of Builting.Executor, it is now 2 pointers.
Update the correct size of Builting.Executor, it is now 2 pointers.

Fixes an assertion while building the Concurrency module.

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