[runtime] More LookupIterator / Transition related performance tweaks

src/objects-inl.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // Review notes:
 //
 // - The use of macros in these inline functions may seem superfluous
 // but it is absolutely needed to make sure gcc generates optimal
 // code. gcc is not happy when attempting to inline too deep.
 //
@@ skipping 6590 matching lines @@
 
 bool JSObject::HasFastStringWrapperElements() {
   return GetElementsKind() == FAST_STRING_WRAPPER_ELEMENTS;
 }
 
 bool JSObject::HasSlowStringWrapperElements() {
   return GetElementsKind() == SLOW_STRING_WRAPPER_ELEMENTS;
 }
 
 bool JSObject::HasFixedTypedArrayElements() {
-  HeapObject* array = elements();
-  DCHECK(array != NULL);
-  return array->IsFixedTypedArrayBase();
+  DCHECK_NOT_NULL(elements());
+  return map()->has_fixed_typed_array_elements();
 }
 
 #define FIXED_TYPED_ELEMENTS_CHECK(Type, type, TYPE, ctype, size)      \
   bool JSObject::HasFixed##Type##Elements() {                          \
     HeapObject* array = elements();                                    \
     DCHECK(array != NULL);                                             \
     if (!array->IsHeapObject()) return false;                          \
     return array->map()->instance_type() == FIXED_##TYPE##_ARRAY_TYPE; \
   }
 
@@ skipping 1061 matching lines @@
 #undef WRITE_INT64_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_OBJECTS_INL_H_