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ac/llvm: use set.inactive for dual source blends

Pierre-Eric Pelloux-Prayer requested to merge pepp/mesa:radeonsi_fix_gfx11_dualsource_blend into main

Dual source blends use DPP which enables strict WQM mode.

We need to use set.inactive to avoid the WQM mode to leak in the rest of the shader.

The _ac_build_dual_src_blend_swizzle changes deal with PS epilog, and the nir_intrinsic_quad_swizzle_amd one deals with monolithic PS.

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