[llvm] [VPlan] Use pointer to member 0 as VPInterleaveRecipe's pointer arg. (PR #106431)

[Alexander Kornienko via llvm-commits]

alexfh wrote:

Hi @fhahn,  a heads up: some of our tests started failing on aarch64 after this commit. Bisecting with `-opt-bisect-limit` points to `LoopVectorizePass` on a certain function. I'm trying to figure out if there's a UB in the original code, but so far I don't see anything suspicious. I'll try to provide a test case, if I don't find problems with the original code.

https://github.com/llvm/llvm-project/pull/106431