[llvm] [VPlan] Make CanIV part of region. (PR #144803)

[via llvm-commits]

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@@ -268,16 +265,15 @@ Type *VPTypeAnalysis::inferScalarType(const VPValue *V) {
 
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ayalz wrote:

Canonical IV is considered live-in above?

https://github.com/llvm/llvm-project/pull/144803