[llvm] [VPlan] Manage instruction metadata in VPlan. (PR #135272)

[via llvm-commits]

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@@ -290,13 +290,6 @@ struct VPTransformState {
   /// vector loop.
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ayalz wrote:

Is the above description still accurate? Would be good to clarify when State.addNewMetadata(To, Orig) needs to complement applyMetadata(To). Will possibly be handled by #136450

https://github.com/llvm/llvm-project/pull/135272