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freedreno/ir3: remap FRAG_RESULT_COLOR to _DATA* for dual-src blending

Danylo Piliaiev requested to merge Danil/mesa:freedreno/fix/dual-src-blend-gl_SecondaryFragColorEXT into master

gl_SecondaryFragColorEXT is mapped to FRAG_RESULT_COLOR and just have a different io.dual_source_blend_index. We don't need to replicate the color to other render targets in case of dual source blending, so we could just remap it to FRAG_RESULT_DATA0 + index.

Fixes piglit test:

 arb_blend_func_extended-fbo-extended-blend-pattern_gles2

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