r201901 - Reapply 201734 but with appropriate gcc compatibility

[Chandler Carruth]

(last comment, I promise)

On Fri, Feb 21, 2014 at 3:08 PM, Warren Hunt <whunt at google.com> wrote:

> -/* FIXME: We have to #define this because "sel" must be a constant
> integer, and
> -   Sema doesn't do any form of constant propagation yet. */
> -
>

Can we keep this comment? It still seems relevant.
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