[PATCH] Adds Cortex-A53 and Cortex-A57 subtargets.

[Dave Estes]

> Thanks for working on this. LGTM.
>
> Tim and Jiangning, are you ok with this change?

Thanks a bunch for the feedback, Ana.

I would really appreciate some additional feedback from Andy, Tim, or 
anyone else with experience in the new Machine Model. Cortex-A53 is 
mostly in-order, so the model I developed is somewhat trivial. However, 
I feel like I need confirmation of my approach of this rudimentary first 
implementation before I start modeling any of the more sophisticated 
aspects of the processor: forwarding, issue-width restrictions, mid-pipe 
hazards in the Neon/FP Mult/Div/MAC/Sqrt pipeline, etc.

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