R=ulan@chromium.org BUG= Review URL: https://chromiumcodereview.appspot.com/10855099 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12289 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
BUG= TEST= Review URL: https://chromiumcodereview.appspot.com/10807024 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12148 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
(behind FLAG_count_based_interrupts; only on ia32) Review URL: https://chromiumcodereview.appspot.com/9373028 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10699 ce2b1a6d-e550-0410-aec6-3dcde31c8c00