Reland r13188, r13194, r13256 (Deferred formatting of error stack trace during GC).

src/heap-inl.h

Index: src/heap-inl.h
diff --git a/src/heap-inl.h b/src/heap-inl.h
index 6f4b69c0a4b6864d5ab209dfe3172e8a46a5b8e6..08ca47b6fbd4765e92f37a10d7872af155e62f32 100644
--- a/src/heap-inl.h
+++ b/src/heap-inl.h
@@ -669,6 +669,19 @@ void ExternalStringTable::ShrinkNewStrings(int position) {
 }
 
 
+void ErrorObjectList::Add(JSObject* object) {
+  list_.Add(object);
+}
+
+
+void ErrorObjectList::Iterate(ObjectVisitor* v) {
+  if (!list_.is_empty()) {
+    Object** start = &list_[0];
+    v->VisitPointers(start, start + list_.length());
+  }
+}
+
+
 void Heap::ClearInstanceofCache() {
   set_instanceof_cache_function(the_hole_value());
 }