Hide internal references pointing to the empty array in heap profiler.

src/profile-generator.cc

Index: src/profile-generator.cc
diff --git a/src/profile-generator.cc b/src/profile-generator.cc
index f0aaa499e72527f6a08d0cc284e7a98fd59381c0..874511e36ab14614e1d44970f14911d921aa9ed4 100644
--- a/src/profile-generator.cc
+++ b/src/profile-generator.cc
@@ -2519,15 +2519,17 @@ void V8HeapExplorer::SetInternalReference(HeapObject* parent_obj,
                                           Object* child_obj,
                                           int field_offset) {
   HeapEntry* child_entry = GetEntry(child_obj);
-  if (child_entry != NULL) {
+  if (child_entry == NULL) return;
+  // We have to use raw_unchecked_* version because when the
+  // empty_fixed_array itself is being processed all its inline properties
+  // are invalid and the check in empty_fixed_array() function fails.
+  if (child_obj != heap_->raw_unchecked_empty_fixed_array()) {
     filler_->SetNamedReference(HeapGraphEdge::kInternal,
-                               parent_obj,
-                               parent_entry,
+                               parent_obj, parent_entry,
                                reference_name,
-                               child_obj,
-                               child_entry);
-    IndexedReferencesExtractor::MarkVisitedField(parent_obj, field_offset);
+                               child_obj, child_entry);
   }
+  IndexedReferencesExtractor::MarkVisitedField(parent_obj, field_offset);
 }
 
 
@@ -2537,15 +2539,15 @@ void V8HeapExplorer::SetInternalReference(HeapObject* parent_obj,
                                           Object* child_obj,
                                           int field_offset) {
   HeapEntry* child_entry = GetEntry(child_obj);
-  if (child_entry != NULL) {
+  if (child_entry == NULL) return;
+  // See the comment regarding raw_unchecked_* above.
+  if (child_obj != heap_->raw_unchecked_empty_fixed_array()) {
     filler_->SetNamedReference(HeapGraphEdge::kInternal,
-                               parent_obj,
-                               parent_entry,
+                               parent_obj, parent_entry,
                                collection_->names()->GetName(index),
-                               child_obj,
-                               child_entry);
-    IndexedReferencesExtractor::MarkVisitedField(parent_obj, field_offset);
+                               child_obj, child_entry);
   }
+  IndexedReferencesExtractor::MarkVisitedField(parent_obj, field_offset);
 }