[Mesa-stable] Cherry-pick commit 49e04312 to 10.4

[Emil Velikov]

On 24 February 2015 at 20:01, Matt Turner <mattst88 at gmail.com> wrote:
> Please cherry-pick
>
> commit 49e04312116e4f7bbb9ebcc59247a0bcb89c3064
> Author: Abdiel Janulgue <abdiel.janulgue at linux.intel.com>
> Date:   Mon Dec 1 14:59:08 2014 +0200
>
>     st/mesa: For vertex shaders, don't emit saturate when SM 3.0 is unsupported
>
> to the 10.4 branch. Without it, IIRC R300g is broken.
Seems like commit 4ea8c8d56ca(glsl: Don't optimize min/max into
saturate when EmitNoSat is set) is a prerequisite for this commit so
I've went ahead and picked both. Let me know if this sounds ok.

Thanks
Emil