[turbofan] Disable value numbering for now.
[turbofan] Disable value numbering for now.

TEST=cctest,mjsunit
R=jarin@chromium.org

Review URL: https://codereview.chromium.org/594443002

git-svn-id: f98b9d40cb02301bc76fa9e1b46ee668158567fd@24104 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh