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Running The RadeonSI NIR Back-End With Mesa 19.1 Git

Switching to the RadeonSI NIR code did boost the average frame-rates in a number of recent OpenGL Linux games, but the minimum frame-rates did drop along this non-default code path.

Fortunately, in many games, the dip in minimum frame-rate was quite small.

In some OpenGL games, the performance was indifferent between TGSI and NIR.