Do not mark dependent_code arrays as weak in heap snapshot.

Review-Url: https://codereview.chromium.org/2197393003
Cr-Commit-Position: refs/heads/master@{#38251}

src/profiler/heap-snapshot-generator.cc

@@ -1319,7 +1319,6 @@ void V8HeapExplorer::ExtractMapReferences(int entry, Map* map) {
                          Map::kConstructorOrBackPointerOffset);
   }
   TagObject(map->dependent_code(), "(dependent code)");
-  MarkAsWeakContainer(map->dependent_code());
   SetInternalReference(map, entry, "dependent_code", map->dependent_code(),
                        Map::kDependentCodeOffset);
   TagObject(map->weak_cell_cache(), "(weak cell)");
@@ -1495,7 +1494,7 @@ void V8HeapExplorer::ExtractPropertyCellReferences(int entry,
                                                    PropertyCell* cell) {
   SetInternalReference(cell, entry, "value", cell->value(),
                        PropertyCell::kValueOffset);
-  MarkAsWeakContainer(cell->dependent_code());
+  TagObject(cell->dependent_code(), "(dependent code)");
   SetInternalReference(cell, entry, "dependent_code", cell->dependent_code(),
                        PropertyCell::kDependentCodeOffset);
 }
@@ -1507,7 +1506,7 @@ void V8HeapExplorer::ExtractAllocationSiteReferences(int entry,
                        AllocationSite::kTransitionInfoOffset);
   SetInternalReference(site, entry, "nested_site", site->nested_site(),
                        AllocationSite::kNestedSiteOffset);
-  MarkAsWeakContainer(site->dependent_code());
+  TagObject(site->dependent_code(), "(dependent code)");
   SetInternalReference(site, entry, "dependent_code", site->dependent_code(),
                        AllocationSite::kDependentCodeOffset);
   // Do not visit weak_next as it is not visited by the StaticVisitor,

test/cctest/test-heap-profiler.cc

@@ -2824,7 +2824,7 @@ TEST(WeakContainers) {
   CHECK_NE(0, count);
   for (int i = 0; i < count; ++i) {
     const v8::HeapGraphEdge* prop = dependent_code->GetChild(i);
-    CHECK_EQ(v8::HeapGraphEdge::kWeak, prop->GetType());
+    CHECK_EQ(v8::HeapGraphEdge::kInternal, prop->GetType());
   }
 }