We need to size arrays better

Checking sunspider crypto-aes 18% of the time is spent in some virtual call that we can't inline from MixColumns (due to missing type check - Hotspot fix hopefully handles this)

Then everything is dependent on ScriptObject.doesNotHave, and various arrayData.ensure functions.

We need to allocate more than just the array space we need for growing arrays incrementally so this doesn't keep happening.