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aco: A few minor improvements to NGG GS

Timur Kristóf requested to merge Venemo/mesa:aco-ngg-gs-fix4 into master

This MR adds a few minor improvements to the ACO NGG GS implementation.

It adds a few "sanity check" type assertions and a few minor fixes. Most notably, we now check if the output primitive count is zero, and if so, export a zero-area triangle. This is recommended by AMD developers to make sure to avoid a possible hang in the Navi 1x NGG hardware.

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