Mesa 22.2 Lands The Big Removal Of Old GLSL-To-TGSI Path, Now Always Going Through NIR

Emma Anholt's perseverance the past year has paid off in freeing Mesa of the "glsl_to_tgsi" function with now all Mesa drivers going the route of from GLSL to the NIR intermediate representation. For Mesa drivers lacking native NIR consumption, there is then the NIR-to-TGSI path for going back to that traditional Gallium3D IR...