Speed up a regression test regress-3249650.js so it does not timeout.

Review URL: http://codereview.chromium.org/6175001

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6228 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

test/mjsunit/compiler/regress-3249650.js

@@ -50,4 +50,4 @@ function test(x) {
 }
 
 var x = {a: {b: "" }};
-for (var i = 0; i < 1000000; i++) test(x);
+for (var i = 0; i < 20000; i++) test(x);