R=svenpanne@chromium.org
BUG=v8:2628
TEST=cctest/test-cpu-profiler/CollectCpuProfile

Review URL: https://codereview.chromium.org/14767021

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14574 ce2b1a6d-e550-0410-aec6-3dcde31c8c00