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

[Florian Hahn via llvm-commits]

================
@@ -2413,10 +2414,11 @@ void VPInterleaveRecipe::execute(VPTransformState &State) {
     Idx = State.Builder.CreateSub(RuntimeVF, State.Builder.getInt32(1));
     Idx = State.Builder.CreateMul(Idx,
                                   State.Builder.getInt32(Group->getFactor()));
----------------
fhahn wrote:

Yes I think so, we just don't have to compute the index for the first lane (used to be done via the removed add)

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