Add "has fast elements" bit to maps and use it in inlined keyed loads.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index d6571bff090a5eb9cf568d054b3b490599d3104d..f9def82d23f707ec4c9e6f2145672c931092ee34 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -1166,6 +1166,8 @@ HeapObject* JSObject::elements() {
 
 
 void JSObject::set_elements(HeapObject* value, WriteBarrierMode mode) {
+  ASSERT(map()->has_fast_elements() ==
+         (value->map() == Heap::fixed_array_map()));
   // In the assert below Dictionary is covered under FixedArray.
   ASSERT(value->IsFixedArray() || value->IsPixelArray() ||
          value->IsExternalArray());
@@ -1181,11 +1183,21 @@ void JSObject::initialize_properties() {
 
 
 void JSObject::initialize_elements() {
+  ASSERT(map()->has_fast_elements());
   ASSERT(!Heap::InNewSpace(Heap::empty_fixed_array()));
   WRITE_FIELD(this, kElementsOffset, Heap::empty_fixed_array());
 }
 
 
+Object* JSObject::ResetElements() {
+  Object* obj = map()->GetFastElementsMap();
+  if (obj->IsFailure()) return obj;
+  set_map(Map::cast(obj));
+  initialize_elements();
+  return this;
+}
+
+
 ACCESSORS(Oddball, to_string, String, kToStringOffset)
 ACCESSORS(Oddball, to_number, Object, kToNumberOffset)
 
@@ -2335,6 +2347,26 @@ void Map::set_prototype(Object* value, WriteBarrierMode mode) {
 }
 
 
+Object* Map::GetFastElementsMap() {
+  if (has_fast_elements()) return this;
+  Object* obj = CopyDropTransitions();
+  if (obj->IsFailure()) return obj;
+  Map* new_map = Map::cast(obj);
+  new_map->set_has_fast_elements(true);
+  return new_map;
+}
+
+
+Object* Map::GetSlowElementsMap() {
+  if (!has_fast_elements()) return this;
+  Object* obj = CopyDropTransitions();
+  if (obj->IsFailure()) return obj;
+  Map* new_map = Map::cast(obj);
+  new_map->set_has_fast_elements(false);
+  return new_map;
+}
+
+
 ACCESSORS(Map, instance_descriptors, DescriptorArray,
           kInstanceDescriptorsOffset)
 ACCESSORS(Map, code_cache, Object, kCodeCacheOffset)
@@ -2838,11 +2870,14 @@ JSObject::ElementsKind JSObject::GetElementsKind() {
   if (array->IsFixedArray()) {
     // FAST_ELEMENTS or DICTIONARY_ELEMENTS are both stored in a FixedArray.
     if (array->map() == Heap::fixed_array_map()) {
+      ASSERT(map()->has_fast_elements());
       return FAST_ELEMENTS;
     }
     ASSERT(array->IsDictionary());
+    ASSERT(!map()->has_fast_elements());
     return DICTIONARY_ELEMENTS;
   }
+  ASSERT(!map()->has_fast_elements());
   if (array->IsExternalArray()) {
     switch (array->map()->instance_type()) {
       case EXTERNAL_BYTE_ARRAY_TYPE: