Bug 868535 - IonMonkey: Optimize signed division by constant power of 2. r=nbp
Bug 868027 - Use push to push integer registers onto the stack on x64. r=nbp

Use push instead of adjusting the stack pointer and doing stores manually.
This significantly reduces code size for these sequences.
Bug 868556 - We are not using gralloc on b2g anymore - r=vladv