Doing so makes the max new space size influence the initial total size
of the heap.

This change reduces the initial memory use of V8 by over 6MB.

Review URL: http://codereview.chromium.org/202017

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2851 ce2b1a6d-e550-0410-aec6-3dcde31c8c00