Fix ugly typo in GenerateNewNonStrictFast.

test/mjsunit/regress/regress-crbug-157520.js

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-"a".replace(/a/g, function() { return "c"; });
+// Flags: --nocrankshaft
 
-function test() {
-  try {
-    test();
-  } catch(e) {
-    "b".replace(/(b)/g, function() { return "c"; });
+(function(){
+  var f = function(arg) {
+    arg = 2;
+    return arguments[0];
+  };
+  for (var i = 0; i < 50000; i++) { 
+    assertSame(2, f(1));
   }
-}
-
-test();
+})();