Remove unused 'receiver' field from generators

src/runtime/runtime-debug.cc

Index: src/runtime/runtime-debug.cc
diff --git a/src/runtime/runtime-debug.cc b/src/runtime/runtime-debug.cc
index 94c2992fc2965ac022244d902803ef59390d1ce9..b23499370ba7e0372d027f5da8ea97afa712d65f 100644
--- a/src/runtime/runtime-debug.cc
+++ b/src/runtime/runtime-debug.cc
@@ -235,10 +235,6 @@ MaybeHandle<JSArray> Runtime::GetInternalProperties(Isolate* isolate,
     result->set(2, *function);
     result->set(3, generator->function());
 
-    Handle<String> receiver =
-        factory->NewStringFromAsciiChecked("[[GeneratorReceiver]]");
-    result->set(4, *receiver);
-    result->set(5, generator->receiver());
     return factory->NewJSArrayWithElements(result);
   } else if (Object::IsPromise(object)) {
     Handle<JSObject> promise = Handle<JSObject>::cast(object);
@@ -695,7 +691,14 @@ RUNTIME_FUNCTION(Runtime_GetFrameDetails) {
   // Add the receiver (same as in function frame).
   Handle<Object> receiver(it.frame()->receiver(), isolate);
   DCHECK(!function->shared()->IsBuiltin());
-  DCHECK_IMPLIES(is_sloppy(shared->language_mode()), receiver->IsJSReceiver());
+  DCHECK_IMPLIES(
+      is_sloppy(shared->language_mode()),
+      receiver->IsJSReceiver() ||
+          // If this frame is a resumed generator, the receiver may be the hole,
+          // but
+          // it will not be observed as such due to forced context allocation.
+          (*receiver == isolate->heap()->the_hole_value() &&
+           function->shared()->is_generator()));
   details->set(kFrameDetailsReceiverIndex, *receiver);
 
   DCHECK_EQ(details_size, details_index);