[llvm] [SLP] no need to generate extract for in-tree uses for original scala… (PR #76077)

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Enna1 wrote:

Thanks for your kind response and detailed explanation.

I have updated the patch based on your diff.
But I don't come up a better way to relax the assertion https://github.com/llvm/llvm-project/commit/dd0dd255e65df5713847de74eee7c5c15a6f8a69#diff-e3b933e8c46156c0eaf7cbb67866b712f69a8484bc941d10acec9d4d17b9f061L11954-L11956

PTAL.

https://github.com/llvm/llvm-project/pull/76077