[llvm] [VPlan] Manage created blocks directly in VPlan. (NFC) (PR #120918)

[via llvm-commits]

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@@ -3812,6 +3781,10 @@ class VPlan {
   /// been modeled in VPlan directly.
   DenseMap<const SCEV *, VPValue *> SCEVToExpansion;
 
+  /// Blocks allocated and owned by the VPlan. They will be deleted once the
+  /// VPlan is destroyed.
+  SmallVector<VPBlockBase *> CreatedBlocks;
+
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ayalz wrote:

nit: perhaps better positioned next to VPLiveInsToFree above.

https://github.com/llvm/llvm-project/pull/120918