Replace AddProperty by AddNamedProperty to speed up the common case

test/mjsunit/regress/regress-cntl-descriptors-enum.js

 // Copyright 2012 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 12 matching lines @@
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Flags: --allow-natives-syntax --expose-gc
 
 DontEnum = 2;
 
 var o = {};
-%AddProperty(o, "a", 0, DontEnum);
+%AddNamedProperty(o, "a", 0, DontEnum);
 
 var o2 = {};
-%AddProperty(o2, "a", 0, DontEnum);
+%AddNamedProperty(o2, "a", 0, DontEnum);
 
 assertTrue(%HaveSameMap(o, o2));
 
 o.y = 2;
 
 for (var v in o) { print(v); }
 o = {};
 gc();
 
 for (var v in o2) { print(v); }