target/arm: Inline scalar SQADD, UQADD, SQSUB, UQSUB

This eliminates the last uses of these neon helpers.
Incorporate the MO_64 expanders as an option to the vector expander.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240528203044.612851-7-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
5 files changed