We use the CodeBlock* field of RepatchBuffer in various places. Usually, when we use this field, we're doing it wrong, since we never really know which CodeBlock* the RepatchBuffer points to.
Also, this field was there to support WX_EXCLUSIVE, which doesn't work anymore and probably never will (since nobody is working on it). Killing that feature means that we no longer have to be careful about caching a RepatchBuffer and passing it around.
Created attachment 260498 [details]
Created attachment 260500 [details]
Comment on attachment 260500 [details]
Landed in http://trac.webkit.org/changeset/189278