[llvm] [VPlan] Add VPIRInstruction, use for exit block live-outs. (PR #100735)

[via llvm-commits]

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@@ -972,7 +980,7 @@ void VPlan::prepareToExecute(Value *TripCountV, Value *VectorTripCountV,
 /// predecessor, which is rewired to the new VPIRBasicBlock. All successors of
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ayalz wrote:

Worth clarifying and asserting (independently).

https://github.com/llvm/llvm-project/pull/100735