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

[via llvm-commits]

================
@@ -51,6 +52,7 @@ class LLVM_ABI_FOR_TEST VPValue {
   friend class VPInterleaveRecipe;
   friend class VPlan;
   friend class VPExpressionRecipe;
+  friend class VPCanonicalIV;
----------------
ayalz wrote:

ditto

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