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Convert the Neon VQABS and VQNEG insns to decodetree. Since these are the only ones which need cpu_env passing to the helper, we wrap the helper rather than creating a whole new do_2misc_env() function. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 20200616170844.13318-15-peter.maydell@linaro.org