Merged: [heap] Filter out non-heap values when tracing wrappers

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 8f9ca63abbd7c7cbc2645451ad82d648458b8d32..59a4d4ba5c14cac88e0f2875beb2e518afd6103e 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -5661,6 +5661,9 @@ void Heap::TracePossibleWrapper(JSObject* js_object) {
 }
 
 void Heap::RegisterExternallyReferencedObject(Object** object) {
+  // The embedder is not aware of whether numbers are materialized as heap
+  // objects are just passed around as Smis.
+  if (!(*object)->IsHeapObject()) return;
   HeapObject* heap_object = HeapObject::cast(*object);
   DCHECK(Contains(heap_object));
   if (FLAG_incremental_marking_wrappers && incremental_marking()->IsMarking()) {