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nir/gallium: Add compiler option for lowering uniforms to UBO (rewrite)

Gert Wollny requested to merge gerddie/mesa:gallium-lower-uniforms-nir-option into master

This option can be set by drivers that don't support CAP_PACKED_UNIFORMS but still want the lowering to be done in the state tracker and tgsi_to_nir.

Consequently, with this MR all decisions related to lowering uniforms to UBO use this flag, and, like suggested by @anholt, whether using a multiplier of 4 or 16 is based on the support for packed uniforms.

CC: freedreno: @robclark llvmpipe: @airlied intel/compiler: @jekstrand radeonsi: @mareko

Edited by Gert Wollny

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