InstCombine: fold (sitofp (zext x)) to (uitofp x)

[David Majnemer]

This looks good to me.

On Mon, Apr 13, 2015 at 11:52 PM, Fiona Glaser <fglaser at apple.com> wrote:

> I’m 87.23% certain this optimization is reasonable.
>
> Fiona
>
>
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