Port r10699 (18a0fc0).

Original commit message:

(behind FLAG_count_based_interrupts; only on ia32)

BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/9420005
Patch from Daniel Kalmar <kalmard@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10720 ce2b1a6d-e550-0410-aec6-3dcde31c8c00