repl: pass objectGroup to Runtime.awaitPromise to prevent GC collection

lib/internal/repl/inspector.js

@@ -179,13 +179,16 @@ class ReplInspectorChannel {
       return response;
     }
 
-    // Hold the promise open until it resolves or rejects,
-    // so we can return the final value.
+    // Hold the promise open until it resolves or rejects.
+    // Pass objectGroup so the promise remote object stays retained for the
+    // duration of the await and cannot be collected by a GC cycle between
+    // the two inspector calls.
     return this.postInterruptible('Runtime.awaitPromise', {
       __proto__: null,
       promiseObjectId: response.result.objectId,
       returnByValue: params.returnByValue,
       generatePreview: params.generatePreview,
+      objectGroup: this.objectGroup,
     }, breakOnSigint);
   }