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radeonsi: disable compute blit when use aco

Qiang Yu requested to merge yuq825/mesa:topic/disable-gfx11-cs-blit into main

ACO generated code does not work when fp16_rtz==true, like piglit test:

  spec@arb_copy_image@arb_copy_image-simple --rb-to-rb

I've found one problem that ACO does not support vector nir_f2f16_rtz, like 2x16 ssa1 = nir_f2f16_rtz ssa0.xy. But after fixing this problem the test result only gets improved instead of passing. Maybe there are some image coherency problem as found by piglit test:

  spec@arb_shader_image_load_store@coherency

So disable this before we completely fix all the problem.

Edited by Qiang Yu

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