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radv: Improve SGPR emission for last_vgt_api_stage - CPU overhead part 2

Timur Kristóf requested to merge Venemo/mesa:radv_cpu_overhead_vgt_api_stage into main

Stop using radv_lookup_user_sgpr for the last pre-rasterization stage.

Tested on Ryzen 7 6850U: set the platform profile to performance, disabled boost and set the CPU governor to performance. Then ran: ./vkoverhead -test 0 -duration 30

commit 6850U score 3700X score by @mbriar
main 20772 17341
radv: use direct access to last_vgt_api_stage_locs for sgpr emission 20849 (+0.03%) 21421 (+23.5%)
Edited by Timur Kristóf

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