arb_point_sprite-mipmap renders polygons with polygon mode set to POINT.
However, r300 point-sprite setup only treated MESA_PRIM_POINTS as point
draws, so sprite coord replacement was disabled for polygon primitives
that were rasterized as points. This produced wrong texcoord orientation
and failed the piglit test.
Detect point rasterization from the primitive plus rasterizer fill/cull
state and use that in both HWTCL and SWTCL draw paths when updating
is_point flag.
The test now pass on RV370 and fails with the rest of the CI HW, but the
remaining issues seem to be some LOD boundary mismatch at point size 22,
the hardware samples level 0 where test expects level 1. In total only 4
cases now fail instead of 82 before.
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/39850>
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