[early patch] Speed up decl chaining

[Chandler Carruth]

On Fri, Oct 18, 2013 at 9:24 PM, Rafael Espíndola <
rafael.espindola at gmail.com> wrote:

> > What about just storing both the first and the last and keeping the
> > direction as it is now?
>
> Storing it where?
>

Uh, yea. Ignore me. ;]

The other solution of course is to not make it a circular list, but I
assume there is a good reason for doing that?
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