[PATCH] fix PR15296

[Michael Liao]

Hi All,

This patch fixes PR15296 by lowering SRA/SRL/SHL into PSRA/PSRL/PSHL
during DAG lowering instead of DAG combining, because 256-bit integer
vector will be expanded in lowering where DAG combining will lose the
chance to transform it.

Thanks for your review
- Michael

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