[llvm] [LoongArch] lower vector shuffle to shift if possible (PR #132866)

[via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
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heiher wrote:

Please pre-commit the LASX test cases to better highlight the effects of the optimizations. :)

https://github.com/llvm/llvm-project/pull/132866