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zink: edge flags, stipple lines fixes and other improvements

Antonino Maniscalco requested to merge antonino/mesa:quad_decompose_refactor into main

This MR contains the following improvements to zink:

  • implements edge flags emulation
  • fixes some existing bugs with stipple lines emulation
  • fixes quad rendering when using the line raster primitive (a diagonal line was previously rendered)
  • as a side effect of the previous point zink now handles quads in a geometry shader

The last commit still needs some work as it uses specialization constants. nir_variable is used to access them in nir shaders and the nir_to_spirv translator was hacked to not emit a load when nir_load_variable is used on a specialization constant.

Closes: #3180 (closed) Closes: #2995 (closed)

Edited by Antonino Maniscalco

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