Bug 899139 - Part 1: Refactor value-to-int logic into IonMacroAssembler. (r=jandem)
Bug 899139 - Part 2: SetElementIC typed array stubs. (r=jandem)
Bug 899139 - Part 3: Install SetElementIC for typed array writes. (r=bhackett)
Bug 899139 - Part 4: Refactor lowering byte registers for x86. (r=jandem)