[llvm] [SelectionDAG] Use unaligned store to move AVX registers onto stack for `extractelement` (PR #78422)

[Matt Arsenault via llvm-commits]

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+; RUN: llc < %s  | FileCheck %s
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arsenm wrote:

Use -mtriple, and remove the triple/datalayout from the IR 

https://github.com/llvm/llvm-project/pull/78422