radeonsi: add a performance tweak for 4 SE parts
radeonsi: add a performance tweak for 4 SE parts

Ported from Vulkan.

Reviewed-by: Nicolai Hähnle <0d0be6cf5ad662651be2dc5dfd44aa2b09d4c1cc@amd.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler