Concurrency: Avoid importing Dispatch with no global executor (#37059)
Concurrency: Avoid importing Dispatch with no global executor (#37059)

Dispatch is not available on platforms where `SWIFT_CONCURRENCY_COOPERATIVE_GLOBAL_EXECUTOR` is defined `0`, e.g. WebAssembly/WASI..
glessard/swift,atrick/swift,gregomni/swift,roambotics/swift,atrick/swift,glessard/swift,ahoppen/swift,rudkx/swift,apple/swift,ahoppen/swift,JGiola/swift,rudkx/swift,benlangmuir/swift,roambotics/swift,gregomni/swift,apple/swift,hooman/swift,benlangmuir/swift,glessard/swift,parkera/swift,rudkx/swift,rudkx/swift,tkremenek/swift,atrick/swift,benlangmuir/swift,glessard/swift,ahoppen/swift,benlangmuir/swift,atrick/swift,ahoppen/swift,glessard/swift,xwu/swift,hooman/swift,glessard/swift,parkera/swift,hooman/swift,gregomni/swift,benlangmuir/swift,gregomni/swift,apple/swift,atrick/swift,gregomni/swift,JGiola/swift,roambotics/swift,atrick/swift,tkremenek/swift,parkera/swift,tkremenek/swift,tkremenek/swift,gregomni/swift,hooman/swift,roambotics/swift,xwu/swift,parkera/swift,xwu/swift,benlangmuir/swift,JGiola/swift,tkremenek/swift,ahoppen/swift,tkremenek/swift,parkera/swift,apple/swift,parkera/swift,hooman/swift,JGiola/swift,apple/swift,tkremenek/swift,roambotics/swift,parkera/swift,apple/swift,xwu/swift,roambotics/swift,xwu/swift,xwu/swift,rudkx/swift,JGiola/swift,hooman/swift,hooman/swift,parkera/swift,xwu/swift,ahoppen/swift,JGiola/swift,rudkx/swift