Ensure that ToPositiveInteger is optimizable.

'throw %NAME(..)' cause hydrogen optimizations to be disabled for
surrounding function. This patch rectifies.

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/71153004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17832 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/runtime.js

@@ -665,7 +665,7 @@ function DefaultString(x) {
 
 function ToPositiveInteger(x, rangeErrorName) {
   var i = TO_INTEGER(x);
-  if (i < 0) throw %MakeRangeError(rangeErrorName);
+  if (i < 0) throw MakeRangeError(rangeErrorName);
   return i;
 }