target/arm: Make LD1Q decode and trans fn agree about a->u

target/arm: Make LD1Q decode and trans fn agree about a->u

For the LD1Q instruction (gather load of quadwords) we use the
LD1_zprz pattern with MO_128 elements.  At this element size there is
no signed vs unsigned distinction, and we only set the 'u' bit in the
arg_LD1_zprz struct because we share the code and decode struct with
smaller element sizes.

However, we set u=0 in the decode pattern line but then accidentally
asserted that it was 1 in the trans function.  Since our usual convention
is that the "default" is unsigned and we only mark operations as signed
when they really do need to extend, change the decode pattern line to
set u=1 to match the assert.

Fixes: d2aa9a804ee6 ("target/arm: Implement LD1Q, ST1Q for SVE2p1")
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20250718173032.2498900-11-peter.maydell@linaro.org