Add LSX overrides for [Rounding]ShiftRightAndDemoteTo#3160
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Implements the LSX override for
ShiftRightAndDemoteToandRoundingShiftRightAndDemoteTo, following #3056 for #2628. Narrowing reuses the fusedvssrani/vssrlni(vssrarni/vssrlrnifor the rounding variant) from the existingDemoteTo, passing the shift amount instead of 0; multi-step cases fall back toDemoteTo(d, [Rounding]ShiftRight<k>(v)).LoongArch runs in CI, so the
shift_testdifferential covers this on LSX; I also checked under qemu (gcc-14,-cpu max) and results match the generic path. SVE2/LASX and theDemote2Tovariants stay TODO.