Double max-new-space-size to 2^18 in binary-op-newspace to make the test run on linux 64 with snapshots on.
Review URL: http://codereview.chromium.org/1735014

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4496 ce2b1a6d-e550-0410-aec6-3dcde31c8c00