Reland: Preprocess structured stack trace on GC to get rid of code reference.

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index b526a01535e23f03ac123b1fdf13de6ff3a79edf..ff94105834004077bb8406dad939f42d83e8d6c7 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -407,8 +407,14 @@ Handle<Object> Isolate::CaptureSimpleStackTrace(Handle<JSObject> error_object,
     }
   }
   elements->set(0, Smi::FromInt(sloppy_frames));
+  elements->Shrink(cursor);
   Handle<JSArray> result = factory()->NewJSArrayWithElements(elements);
   result->set_length(Smi::FromInt(cursor));
+  // Queue this structured stack trace for preprocessing on GC.
+  Handle<Object> old_weak_list(heap()->weak_stack_trace_list(), this);
+  Handle<WeakFixedArray> new_weak_list =
+      WeakFixedArray::Add(old_weak_list, elements);
+  factory()->set_weak_stack_trace_list(new_weak_list);
   return result;
 }