Removed superfluous deopt for ROR on ia32.

We only synthesize a ROR when we have an expression with a toplevel
'|', which returns a signed value by definition, so deopting on
negative values is not needed. ia32 was the only platform where this
was done, all other didn't have the check.

R=ulan@chromium.org

Review URL: https://codereview.chromium.org/597503003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24133 ce2b1a6d-e550-0410-aec6-3dcde31c8c00