Bug 953024 - Part 0: Factor out common BC getter stub logic for own getters. (r=djvj)
Bug 953024 - Part 1: Implement own getter cacheing in BC, and use it for JSOP_GETGNAME. (r=djvj)
Bug 953024 - Part 2: Make Ion do common getter optimizations for JSOP_GETGNAME. (r=jandem, f=jwalden over IRC)