[patch] Make the ARM ABI selectable via SubtargetFeature

[Rafael Espíndola]

Ping. This is blocking the patches asserting that llvm and clang use
the same datalayout strings.

On 19 December 2013 15:06, Rafael Espíndola <rafael.espindola at gmail.com> wrote:
> 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