target-arm: A64: add support for 1-src REV insns This adds support for C5.6.149 REV, C5.6.151 REV32, C5.6.150 REV16. Signed-off-by: Claudio Fontana <claudio.fontana@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <rth@twiddle.net>