[llvm] [VPlan] Add ExtractLane VPInst to extract across multiple parts. (PR #148817)

[Florian Hahn via llvm-commits]

fhahn wrote:

> LGTM. With only one vector this behaves like a ExtractElement VPInstruction right? Is it possible to replace ExtractElement with this later?

Yep that should be possible, will look into this a potential follow-up, thanks!

https://github.com/llvm/llvm-project/pull/148817