RemoteInspection: Append ResumeAsyncContext field to AsyncTaskInfo (#78645)

Expose a `Task`'s resume context via the `AsyncTaskInfo` struct.

This will be used by lldb, but since this data is not specific to lldb it seems reasonable to include it generally.

Author: kastiglione

include/swift/RemoteInspection/ReflectionContext.h

@@ -202,6 +202,7 @@ class ReflectionContext
     StoredPointer AllocatorSlabPtr;
     std::vector<StoredPointer> ChildTasks;
     std::vector<StoredPointer> AsyncBacktraceFrames;
+    StoredPointer ResumeAsyncContext;
   };
 
   struct ActorInfo {
@@ -1825,9 +1826,12 @@ class ReflectionContext
       RecordPtr = RecordObj->Parent;
     }
 
+    const auto TaskResumeContext = AsyncTaskObj->ResumeContextAndReserved[0];
+    Info.ResumeAsyncContext = TaskResumeContext;
+
     // Walk the async backtrace.
     if (Info.HasIsRunning && !Info.IsRunning) {
-      auto ResumeContext = AsyncTaskObj->ResumeContextAndReserved[0];
+      auto ResumeContext = TaskResumeContext;
       unsigned AsyncBacktraceLoopCount = 0;
       while (ResumeContext && AsyncBacktraceLoopCount++ < AsyncBacktraceLimit) {
         auto ResumeContextObj = readObj<AsyncContext<Runtime>>(ResumeContext);