While testing ProfLazyMode stability I encountered a situation when the cycle supposed to run for 200 ms started to run "infinitely" because delta between two int64_t values became negative.

Review URL: http://codereview.chromium.org/115918


git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2078 ce2b1a6d-e550-0410-aec6-3dcde31c8c00