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

[Florian Hahn via llvm-commits]

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@@ -89,7 +96,9 @@ class LLVM_ABI_FOR_TEST VPValue {
   enum {
     VPValueSC, /// A generic VPValue, like live-in values or defined by a recipe
                /// that defines multiple values.
-    VPVRecipeSC /// A VPValue sub-class that is a VPRecipeBase.
+    VPVRecipeSC,     /// A VPValue sub-class that is a VPRecipeBase.
+    VPRegionValueSC, /// A VPValue sub-class that is defined by a region, like
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fhahn wrote:

This should now be consisten with VPRecipeValue

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