R600: Fix min/max matching problems with unordered compares

[Matt Arsenault]

> On Nov 21, 2014, at 5:18 AM, Marek Olšák <maraeo at gmail.com> wrote:
> 
> I've just discovered that the bug can also be fixed by setting
> isCommutable=0 for MIN/MAX_LEGACY. The patch is attached. What do you
> think?

Yes, they should not be commutable. LGTM
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