Support Smi in CompareIDAndBranch

BUG=
R=jkummerow@chromium.org

Review URL: https://chromiumcodereview.appspot.com/16134003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14842 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Added old data space allocation infrastructure for pretenuring.

BUG=

Review URL: https://codereview.chromium.org/16099004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14843 ce2b1a6d-e550-0410-aec6-3dcde31c8c00