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radeonsi: bump SI_NUM_SHADER_BUFFERS to 32

Pierre-Eric Pelloux-Prayer requested to merge pepp/mesa:radeonsi_bump_num_shader_buffers into master

Some app uses more than 8 SSBOs (#2946 (closed)), so increase SI_NUM_SHADER_BUFFERS to 32 (which allows 16 SSBOs).

Since we're now using a 64 bits number to track buffers, we could bump SI_NUM_SHADER_BUFFERS to 48 but that would conflict with Mesa's MAX_COMBINED_ATOMIC_BUFFERS limit (= 90).

Closes: #2122 (closed)

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