Cosmetic: Add macros for NaN, undefined and Infinity to native js code.

src/array-iterator.js

Index: src/array-iterator.js
diff --git a/src/array-iterator.js b/src/array-iterator.js
index defd7342ab2d4fb62cace6a0bb0e4aecbc457684..e7349868400476dea075d39142e35008d642ec13 100644
--- a/src/array-iterator.js
+++ b/src/array-iterator.js
@@ -36,9 +36,9 @@ var ARRAY_ITERATOR_KIND_VALUES = 2;
 var ARRAY_ITERATOR_KIND_ENTRIES = 3;
 // The spec draft also has "sparse" but it is never used.
 
-var iteratorObjectSymbol = %CreateSymbol(void 0);
-var arrayIteratorNextIndexSymbol = %CreateSymbol(void 0);
-var arrayIterationKindSymbol = %CreateSymbol(void 0);
+var iteratorObjectSymbol = %CreateSymbol(UNDEFINED);
+var arrayIteratorNextIndexSymbol = %CreateSymbol(UNDEFINED);
+var arrayIterationKindSymbol = %CreateSymbol(UNDEFINED);
 
 function ArrayIterator() {}
 
@@ -74,7 +74,7 @@ function ArrayIteratorNext() {
 
   if (index >= length) {
     iterator[arrayIteratorNextIndexSymbol] = 1 / 0; // Infinity
-    return CreateIteratorResultObject(void 0, true);
+    return CreateIteratorResultObject(UNDEFINED, true);
   }
 
   iterator[arrayIteratorNextIndexSymbol] = index + 1;