[LoongArch] Custom lowering for vector logical right shifts of integers (#171097) After PR #169491, the DAG combiner can still recreate vector UDIV in an illegal type even after type legalization, which is the root cause of issue #170976. The optimization introduced in PR #169491 is still desirable, so this patch adds custom lowering for vector integer logical right shifts to prevent the DAG from producing nodes with illegal types. Fixes #170976
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