Excepting MOVPRFX, which isn't a reduction.  Presumably it is
placed within the group because of its encoding.
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>
Message-id: 20180516223007.10256-10-richard.henderson@linaro.org
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>