[llvm] [AArch64] Fix `shufflevector` miscompilation on `aarch64_be` (PR #193076)

[via llvm-commits]

llvmbot wrote:

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Failed to cherry-pick: 7425ab9d95776777959767b6054024bd1725ae76

https://github.com/llvm/llvm-project/actions/runs/24837652216

Please manually backport the fix and push it to your github fork.  Once this is done, please create a [pull request](https://github.com/llvm/llvm-project/compare)

https://github.com/llvm/llvm-project/pull/193076