radeonsi: increase MAX_CONTROL_FLOW_DEPTH AKA MaxIfDepth
radeonsi: increase MAX_CONTROL_FLOW_DEPTH AKA MaxIfDepth

we don't want to lower deep IFs unconditionally

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

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler