Reland [heap] Avoid the use of cells to point from code to new-space objects.

src/objects-debug.cc

Index: src/objects-debug.cc
diff --git a/src/objects-debug.cc b/src/objects-debug.cc
index 0c92f2093247e8940353efa8b9f283ff753ff9d2..caba887e3c6ccaebfbb7c278231ad69ad6c47ebb 100644
--- a/src/objects-debug.cc
+++ b/src/objects-debug.cc
@@ -701,11 +701,25 @@ void Code::VerifyEmbeddedObjectsDependency() {
         CHECK(map->dependent_code()->Contains(DependentCode::kWeakCodeGroup,
                                               cell));
       } else if (obj->IsJSObject()) {
-        WeakHashTable* table =
-            GetIsolate()->heap()->weak_object_to_code_table();
-        Handle<HeapObject> key_obj(HeapObject::cast(obj), isolate);
-        CHECK(DependentCode::cast(table->Lookup(key_obj))
-                  ->Contains(DependentCode::kWeakCodeGroup, cell));
+        if (isolate->heap()->InNewSpace(obj)) {
+          ArrayList* list =
+              GetIsolate()->heap()->weak_new_space_object_to_code_list();
+          bool found = false;
+          for (int i = 0; i < list->Length(); i += 2) {
+            WeakCell* obj_cell = WeakCell::cast(list->Get(i));
+            if (!obj_cell->cleared() && obj_cell->value() == obj &&
+                WeakCell::cast(list->Get(i + 1)) == cell) {
+              found = true;
+              break;
+            }
+          }
+          CHECK(found);
+        } else {
+          Handle<HeapObject> key_obj(HeapObject::cast(obj), isolate);
+          DependentCode* dep =
+              GetIsolate()->heap()->LookupWeakObjectToCodeDependency(key_obj);
+          dep->Contains(DependentCode::kWeakCodeGroup, cell);
+        }
       }
     }
   }