Add complete ElementKind information directly to Map for objects with elements.

src/heap.cc

Index: src/heap.cc
diff --git a/src/heap.cc b/src/heap.cc
index 0a3b3d3f88da06fdfe2a745c2cbb7ecee076e000..0907b06fa5b282b24a5a28e6c13e792e29cf83b3 100644
--- a/src/heap.cc
+++ b/src/heap.cc
@@ -1608,7 +1608,8 @@ MaybeObject* Heap::AllocateMap(InstanceType instance_type, int instance_size) {
   map->set_prototype_transitions(empty_fixed_array());
   map->set_unused_property_fields(0);
   map->set_bit_field(0);
-  map->set_bit_field2((1 << Map::kIsExtensible) | (1 << Map::kHasFastElements));
+  map->set_bit_field2(1 << Map::kIsExtensible);
+  map->set_elements_kind(JSObject::FAST_ELEMENTS);
 
   // If the map object is aligned fill the padding area with Smi 0 objects.
   if (Map::kPadStart < Map::kSize) {