target-arm: A64: Implement remaining integer scalar-3-same insns Implement the remaining integer instructions in the scalar-three-reg-same group: SQADD, UQADD, SQSUB, UQSUB, SQSHL, UQSHL, SQRSHL, UQRSHL, SQDMULH, SQRDMULH. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <rth@twiddle.net>