[llvm] DAG: Move scalarizeExtractedVectorLoad to TargetLowering (PR #122670)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> @arsenm here [dag-armv7-simd_copy.zip](https://github.com/user-attachments/files/18683776/dag-armv7-simd_copy.zip)

Should be fixed by c268a3f0934c625238a1391f6da55c10fecda9de

https://github.com/llvm/llvm-project/pull/122670