According to <http://build.webkit.org/TestFailures/#/Lion%20Debug%20(Tests)>, fast/block/float/float-not-removed-from-next-sibling4.html started failing after r116009. There is a noticeable visible difference and our rendering no longer matches Firefox, so this would appear to be a regression.
Thanks!
Checked in failing results in http://trac.webkit.org/changeset/116143
*** This bug has been marked as a duplicate of bug 68744 ***