Bug 814177 caused 3% regression in v8-raytrace. The fastpath of InstanceOf with Object/Value was removed and uses a VM call now.

I don't see any use of instanceof in v8-raytrace. Where is the operation that regressed?

Hadn't looked into the cause yet. I reported it to make sure I did overlook it. The regression range on awfy only shows bug 814177, but indeed there are no "instanceof" in that code. Very strange! Investigating now.

Probably invalid bug. Can't see any reason why this bug could regress raytrace. I'll leave it open and look at the end of the week again