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lavapipe, nir: Fix wrong array index scaling in nir_collect_src_uniforms

Roland Scheidegger requested to merge sroland/mesa:nir_fix_inline_uniform_index_scaling into main

The scaling needs to be ubo * MAX_INLINABLE_UNIFORMS, not ubo * PIPE_MAX_CONSTANT_BUFFERS, otherwise accesses beyond buffer size will result for ubo >= 4 (and we'd also access the wrong values later for other non-zero ubo indices).

Fixes: a7696a4d ("lavapipe: Fix bad array index scale factor in lvp_inline_uniforms pass")

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