Reland "Handle non-power-of-2 divisors in division-like operations".

Fixed the flooring div bug and added a test case.

R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/191293012

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@19749 ce2b1a6d-e550-0410-aec6-3dcde31c8c00