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panfrost: Skip nir_opt_move/sink for blend shaders

Icecream95 requested to merge icecream95/mesa:dualsrc-fix into master

Otherwise the dual-source input load is moved further down in the shader, so the registers can get clobbered before then.

Fixes text not being visible in Alacritty.

Fixes: 52863f2e ("pan/bi: Enable all nir_opt_move/sink optimizations")

Maybe it would be better to just do precolouring and drop this commit?

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