Bug 897202 - Add some double canonicalization, r=luke a=abillings.
Bug 891607 - Fix typo resulting in a bad surface size in some startup scenarios. r=Cwiiis a=lsblakk
Bug 898047 - Fix Ion to set the Folded flag on arguments MIR when optimizing fun.apply(x, arguments). r=bhackett, a=lsblakk
Bug 887319 - Fix chat window control icons for retina display. r=mconley, a=bajaj