This removes an optimization in the static JSFunction visitor that
eagerly marked through to the SharedFunctionInfo for code flushing
candidates. This causes all processing in VisitJSFunction to be
side-stepped and hence might cause leaks.

R=hpayer@chromium.org

Review URL: https://codereview.chromium.org/1476223002

Cr-Commit-Position: refs/heads/master@{#32332}