setButterfly -> setStructureAndButterfly (which is actually what it does) setStructure(VM&, Structure*, Butterfly*) -> setStructure(VM&, Structure*) and doesn't implicitly assign to the Butterfly.
Created attachment 209306 [details] Patch
Comment on attachment 209306 [details] Patch View in context: https://bugs.webkit.org/attachment.cgi?id=209306&action=review r=me > Source/JavaScriptCore/ChangeLog:11 > + used m_structure internally since that's what every single client of setStructure I think you mean "used m_butterfly".
Committed r154426: <http://trac.webkit.org/changeset/154426>