[llvm] [SelectionDAG] Use unaligned store to legalize `EXTRACT_VECTOR_ELT` type when Stack is non-realignable (PR #98176)

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llvmbot wrote:

Failed to create pull request for issue98176 https://github.com/llvm/llvm-project/actions/runs/10224712349

https://github.com/llvm/llvm-project/pull/98176