Revert 17167:  "Ensure lower <= upper bound"

Due to crashes in nosnap ia32

TBR=rossberg@chromium.org

Review URL: https://codereview.chromium.org/27046002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17170 ce2b1a6d-e550-0410-aec6-3dcde31c8c00