[patch] Start fixing pr24429

[Rafael Espíndola via llvm-commits]

Just noticed I forgot llvm-commits. Sorry about that.

On 11 August 2015 at 10:52, Rafael Espíndola <rafael.espindola at gmail.com> wrote:
> The attached patch just centralizes the knowledge of what file format
> is being used in the triple.
>
> Other than some places that were handling unknown as ELF, this should
> have no change. The test updates are because we were detecting
> arm-coff or x86_64-win64-coff as ELF targets before.
>
> Cheers,
> Rafael