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nir: account for point-coord origin when lowering it

The resulting point-coord origin not only depends on whether the draw buffer is flipped but also on GL_POINT_SPRITE_COORD_ORIGIN state. Which makes its transform differ from a transform of wpos.

On freedreno fixes:

 gl-3.2-pointsprite-origin -fbo

Fixes: d934d320 "nir: Add flipping of gl_PointCoord.y in nir_lower_wpos_ytransform."

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