We currently report how much memory is available without changing page, i.e., the actual amount of available memory is not correctly stated for new space when doing --trace-gc.
Review URL: http://codereview.chromium.org/8275026

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9624 ce2b1a6d-e550-0410-aec6-3dcde31c8c00