Replace AddProperty by AddNamedProperty to speed up the common case

src/array-iterator.js

Index: src/array-iterator.js
diff --git a/src/array-iterator.js b/src/array-iterator.js
index fb18789f988f7b8c8673f6b52014d097fc3cb2dc..f04d6c974a4d41ea27347afde466ec1166e38d31 100644
--- a/src/array-iterator.js
+++ b/src/array-iterator.js
@@ -110,8 +110,8 @@ function SetUpArrayIterator() {
     'next', ArrayIteratorNext
   ));
   %FunctionSetName(ArrayIteratorIterator, '[Symbol.iterator]');
-  %AddProperty(ArrayIterator.prototype, symbolIterator, ArrayIteratorIterator,
-      DONT_ENUM);
+  %AddNamedProperty(ArrayIterator.prototype, symbolIterator,
+                    ArrayIteratorIterator, DONT_ENUM);
 }
 SetUpArrayIterator();
 
@@ -125,7 +125,7 @@ function ExtendArrayPrototype() {
     'keys', ArrayKeys
   ));
 
-  %AddProperty($Array.prototype, symbolIterator, ArrayValues, DONT_ENUM);
+  %AddNamedProperty($Array.prototype, symbolIterator, ArrayValues, DONT_ENUM);
 }
 ExtendArrayPrototype();
 
@@ -146,10 +146,10 @@ macro TYPED_ARRAYS(FUNCTION)
 endmacro
 
 macro EXTEND_TYPED_ARRAY(NAME)
-  %AddProperty($NAME.prototype, 'entries', ArrayEntries, DONT_ENUM);
-  %AddProperty($NAME.prototype, 'values', ArrayValues, DONT_ENUM);
-  %AddProperty($NAME.prototype, 'keys', ArrayKeys, DONT_ENUM);
-  %AddProperty($NAME.prototype, symbolIterator, ArrayValues, DONT_ENUM);
+  %AddNamedProperty($NAME.prototype, 'entries', ArrayEntries, DONT_ENUM);
+  %AddNamedProperty($NAME.prototype, 'values', ArrayValues, DONT_ENUM);
+  %AddNamedProperty($NAME.prototype, 'keys', ArrayKeys, DONT_ENUM);
+  %AddNamedProperty($NAME.prototype, symbolIterator, ArrayValues, DONT_ENUM);
 endmacro
 
   TYPED_ARRAYS(EXTEND_TYPED_ARRAY)