glsl: Extend lowering pass for gl_ClipDistance to support other arrays (v4)

This will come in handy when we want to lower gl_CullDistance into
gl_CullDistanceMESA.

[airlied: drop separate APIs for clip/cull - just use single API
to call both passes.]

v3: reexamine my sanity, this was pretty broken, the new code
creates one copy of gl_ClipDistanceMESA, as the clip distance
varying and lowers everything into that in two passes, one for clips
one for culls.
v4: rework using the passes in clip/cull sizes, instead of the
array sizes.

Signed-off-by: Tobias Klausmann <[email protected]>
Signed-off-by: Dave Airlie <[email protected]>
Reviewed-by: Kristian Høgsberg <[email protected]>

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