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i965/fs: Get rid of fs_visitor::do_dual_src.
This boolean flag was being used for two different things:
- To set the brw_wm_prog_data::dual_src_blend flag. Instead we can
just set it based on whether the dual_src_output register is valid,
which will be the case if the shader writes the secondary blending
color.
- To decide whether to call emit_single_fb_write() once, or in a loop
that would iterate only once, which seems pretty useless.
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>