[llvm] [SLP]Add support for strided loads. (PR #80310)

[Philip Reames via llvm-commits]

https://github.com/preames approved this pull request.

LGTM

However, this a very weak LGTM.  It's more of a "I don't spot any obvious problems" more than "I have any confidence in my ability to catch errors".  

Alexey, take that as you will.  I know we've got a shortage of reviewers in SLP, so feel free to use your judgement here.

https://github.com/llvm/llvm-project/pull/80310