nir_lower_point_size_mov fixes

Here's a couple of fixes for nir_lower_point_size_mov for the case where a shader writes gl_PointSize, but disables GL_PROGRAM_POINT_SIZE.

added NIR label

Patch 1 is r-b.

Patch 2, I'm not sure I understand how this would interact with xfb?

mentioned in merge request !5163 (merged)

added 3 commits

• cd509082 - nir: reuse existing psiz-variable
• a248682d - st/mesa: lower point-size for xfb when lowering point-size
• 91d2e1ee - nir: make constant point-size take presedence

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mentioned in merge request !5328 (merged)

mentioned in merge request !5385 (closed)

mentioned in merge request kusma/mesa!117 (merged)

resolved all threads

added 626 commits

• 91d2e1ee...ad001590 - 624 commits from branch mesa:master
• 2b2b7bfc - st/mesa: lower point-size for xfb when lowering point-size
• aca419fd - nir: make constant point-size take presedence

Compare with previous version

added 2242 commits

• aca419fd...b38879f8 - 2240 commits from branch mesa:master
• acc83ebb - st/mesa: lower point-size for xfb when lowering point-size
• 0c8fb669 - nir: make constant point-size take presedence

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mentioned in issue #3047 (closed)

added 9737 commits

• 0c8fb669...d8fa93a7 - 9735 commits from branch mesa:master
• e5ffdf77 - st/mesa: lower point-size for xfb when lowering point-size
• 3281cbbc - nir: make constant point-size take presedence

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changed target branch from master to main

added 2565 commits

• 3281cbbc...7db79fa6 - 2563 commits from branch mesa:main
• 7730ed3a - st/mesa: lower point-size for xfb when lowering point-size
• 14ae4cc8 - nir: make constant point-size take presedence

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unassigned @kusma

mentioned in issue #6705 (closed)

assigned to @kusma

added 43259 commits

• 14ae4cc8...b8e06fa4 - 43257 commits from branch mesa:main
• 0492c063 - st/mesa: lower point-size for xfb when lowering point-size
• 4361b128 - nir: make constant point-size take presedence

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resolved all threads