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turnip: clamp to zero negative upper left corner of viewport

Danylo Piliaiev requested to merge Danil/mesa:turnip/fix/viewport-min-clamp-to-zero into master

We cannot send negative viewport coordinates to the hardware, so clamp them since negative min.x/y is valid per spec.
The negative origin still counts in calculations of guardband.

Fixes crash in 3DMark's "Sling Shot Extreme" test.

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