Share types on objects with getter/setter properties. If the Accessor bit is set in a property's attributes, that indicates the property is a Getter. The Setter is stored in another slot. Use an array of indices to find the setter associated with a given Getter. Add the option of increasing a TypePath's path length without adding another property ID to its property map. Fix the way we use the accessor inline cache, in both runtime code and jitted code. We need to look at th isOnProto bit to determine which object to get the property from, the object pointed to by the cache (if isOnProto is set) or the current local instance. (This wasn't necessary when objects with accessors didn't share types.) While I was in there, I deleted all the machine-dependent lowering code related to flag caches and added code in Lower.cpp for everyone to share.