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

[Dave Estes]

> Hi Dave,
>
> The error on Darwin is:
>
> Assertion failed: (TM.getSubtarget<AArch64Subtarget>().isTargetELF() && "unknown subtarget type"), function createTLOF, file /s/sched/lib/Target/AArch64/AArch64ISelLowering.cpp, line 35.
>
> Since AArch64 doesn’t appear to be supported on Darwin, you’ll have to add a triple, just like the other AArch64 test cases:
> -mtriple=aarch64-none-linux-gnu
>
> Thanks,
> -Andy

Thank a bunch, Andy!

Just so I understand, the builder was called 
clang-x86_64-darwin11-nobootstrap-RAincremental, but that darwin 
referred to the target and not the host. I spend some time trying to 
figure out where the builder was configuring, but I couldn't find it.

Thanks again, Andy. I'm just glad this wasn't some elaborate rite of 
passage for new submitters. LOL

-Dave

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