Change size of old pointer space first page back to 112KB (as it was before r23241)

This broke ReleaseOverReservedPages on Windows ia32.

TBR=hpayer@chromium.org

Review URL: https://codereview.chromium.org/493703002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23244 ce2b1a6d-e550-0410-aec6-3dcde31c8c00