IRGen: fix the async task type for 32 bit platforms

Author: eeckstein

lib/IRGen/IRGenModule.cpp

@@ -599,10 +599,10 @@ IRGenModule::IRGenModule(IRGenerator &irgen,
   SwiftTaskTy = createStructType(*this, "swift.task", {
     RefCountedStructTy,   // object header
     Int8PtrTy, Int8PtrTy, // Job.SchedulerPrivate
-    Int64Ty,              // Job.Flags
+    SizeTy,               // Job.Flags
     FunctionPtrTy,        // Job.RunJob/Job.ResumeTask
     ContextPtrTy,         // Task.ResumeContext
-    Int64Ty               // Task.Status
+    IntPtrTy              // Task.Status
   });
 
   SwiftExecutorTy = createStructType(*this, "swift.executor", {});