[llvm] [VPlan] Enhance VPlan-based LICM using argument noalias attributes (PR #217238)

[Mel Chen via llvm-commits]

Mel-Chen wrote:

> Does this have any end-to-end impact? Presumably with no alias, IR LICM would already have hoisted the invariant memos?

This patch was created solely to address the unexpected regression noted in https://github.com/llvm/llvm-project/pull/213904#discussion_r3714199107. If this test change is acceptable, I am fine with not landing this patch.

https://github.com/llvm/llvm-project/pull/217238