[llvm] [VPlan] Make canonical IV part of the region (PR #156262)

[via llvm-commits]

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@@ -1397,6 +1433,8 @@ void VPlanPrinter::dumpRegion(const VPRegionBlock *Region) {
 /// Returns true if there is a vector loop region and \p VPV is defined in a
 /// loop region.
 static bool isDefinedInsideLoopRegions(const VPValue *VPV) {
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ayalz wrote:

Independent:
```suggestion
static bool isDefinedInsideLoopRegion(const VPValue *VPV) {
```

https://github.com/llvm/llvm-project/pull/156262