[patch] Make the ARM ABI selectable via SubtargetFeature

[Rafael Espíndola]

Rebased patch attached. I am also including the clang patch I forgot
the first time.

On 18 December 2013 16:23, Rafael Espíndola <rafael.espindola at gmail.com> wrote:
> Hi Tim,
>
> The attached patch makes it possible to select the ABI with -mattr. It
> will be used to forward clang's -target-abi option to llvm's CodeGen.
>
> Cheers,
> Rafael
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