fix not casting result of llvm.coro.promise
fix not casting result of llvm.coro.promise

Dimenus/zig,andrewrk/zig,Dimenus/zig,raulgrell/zig,raulgrell/zig,andrewrk/zig,Dimenus/zig,zig-lang/zig,raulgrell/zig,zig-lang/zig,raulgrell/zig,zig-lang/zig,raulgrell/zig