Patch forthcoming. This appears to still give us a speed-up on the kinds of things that OSR entry is good for, while also eliminating pointless OSR entry compilations on other things.
Created attachment 223211 [details] work in progress Still needs testing. The approach still feels shady.
Created attachment 223309 [details] the patch
Comment on attachment 223309 [details] the patch r=me
Landed in http://trac.webkit.org/changeset/163517