target-ppc: Optimize rlwnm MB=0 ME=31 Optimize the special case of rlwnm where MB=0 and ME=31. This can be implemented using a ROTL. Suggested-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Tom Musta <tommusta@gmail.com> Reviewed-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Alexander Graf <agraf@suse.de>