Implement .of() on typed arrays

src/harmony-typedarray.js

Index: src/harmony-typedarray.js
diff --git a/src/harmony-typedarray.js b/src/harmony-typedarray.js
index 0129f38d507cd0f8d0483a5ba3bbed8a04a2d773..014206c4cba8400cf745b9295d5cb223695ad6cb 100644
--- a/src/harmony-typedarray.js
+++ b/src/harmony-typedarray.js
@@ -58,6 +58,17 @@ function NAMEForEach(f /* thisArg */) {  // length == 1
     %_CallFunction(new_receiver, TO_OBJECT_INLINE(element), i, this, f);
   }
 }
+
+// ES6 draft 08-24-14, section 22.2.2.2
+function NAMEOf() {  // length == 0
+  var length = %_ArgumentsLength();
+  var array = new this(length);
+  for (var i = 0; i < length; i++) {
+    array[i] = %_Arguments(i);
+  }
+  return array;
+}
+
 endmacro
 
 TYPED_ARRAYS(TYPED_ARRAY_HARMONY_ADDITIONS)
@@ -67,6 +78,11 @@ function HarmonyTypedArrayExtendPrototypes() {
 macro EXTEND_TYPED_ARRAY(ARRAY_ID, NAME, ELEMENT_SIZE)
   %CheckIsBootstrapping();
 
+  // Set up non-enumerable functions on the object.
+  InstallFunctions(global.NAME, DONT_ENUM | DONT_DELETE | READ_ONLY, $Array(
+    "of", NAMEOf
+  ));
+
   // Set up non-enumerable functions on the prototype object.
   InstallFunctions(global.NAME.prototype, DONT_ENUM, $Array(
     "forEach", NAMEForEach