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

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dyung wrote:

Hi @fhahn, we are seeing an assertion failure on an internal test which I bisected back to this change. I have put the details in #111606, can you take a look?

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