[patch] Document the bitcode backwards compatibility guarantees

[Eric Christopher]

LGTM in that it seems to be what we agreed on.

-eric

On Wed, Jul 23, 2014 at 9:23 AM, Rafael Espíndola
<rafael.espindola at gmail.com> wrote:
> I think the attached patch contains the rules that we agreed on in the
> llvmdev thread.
>
>
> Cheers,
> Rafael
>
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