Change minimum code range size to 3MB
Change minimum code range size to 3MB

There will be at least 2MB of guard pages around allocatable code memory

BUG=none
R=svenpanne@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/617103006

git-svn-id: f98b9d40cb02301bc76fa9e1b46ee668158567fd@24384 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh