ARM: Implement runtime function for array literal transitions.

src/objects-inl.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 101 matching lines @@
 
 #define BOOL_ACCESSORS(holder, field, name, offset)        \
   bool holder::name() {                                    \
     return BooleanBit::get(field(), offset);               \
   }                                                        \
   void holder::set_##name(bool value) {                    \
     set_##field(BooleanBit::set(field(), offset, value));  \
   }
 
 
+bool IsMoreGeneralElementsKindTransition(ElementsKind from_kind,
+                                         ElementsKind to_kind) {
+  if (to_kind == FAST_ELEMENTS) {
+    return from_kind == FAST_SMI_ONLY_ELEMENTS ||
+        from_kind == FAST_DOUBLE_ELEMENTS;
+  } else {
+    return to_kind == FAST_DOUBLE_ELEMENTS &&
+        from_kind == FAST_SMI_ONLY_ELEMENTS;
+  }
+}
+
+
 bool Object::IsFixedArrayBase() {
   return IsFixedArray() || IsFixedDoubleArray();
 }
 
 
 bool Object::IsInstanceOf(FunctionTemplateInfo* expected) {
   // There is a constraint on the object; check.
   if (!this->IsJSObject()) return false;
   // Fetch the constructor function of the object.
   Object* cons_obj = JSObject::cast(this)->map()->constructor();
@@ skipping 4473 matching lines @@
 #undef WRITE_INT_FIELD
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_