target/arm: Load/store integer pair with one tcg operation

target/arm: Load/store integer pair with one tcg operation

This is required for LSE2, where the pair must be treated atomically if
it does not cross a 16-byte boundary.  But it simplifies the code to do
this always.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20230530191438.411344-10-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>