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

[via llvm-commits]

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@@ -4080,6 +4061,44 @@ class VPlan {
   /// Clone the current VPlan, update all VPValues of the new VPlan and cloned
   /// recipes to refer to the clones, and return it.
   VPlan *duplicate();
+
+  /// Create a new VPBasicBlock with \p Name and containing \p Recipe if
+  /// present. The returned block is owned by the VPlan and deleted once the
+  /// VPlan is destroyed.
+  VPBasicBlock *createVPBasicBlock(const Twine &Name,
+                                   VPRecipeBase *Recipe = nullptr) {
+    auto *VPB = new VPBasicBlock(Name, Recipe);
+    CreatedBlocks.push_back(VPB);
+    return VPB;
+  }
+
+  /// Create a new VPRegionBlock with \p Entry, \p Exiting and \p Name. If \p
+  /// IsReplicator is true, the region is a replicate region. The returned block
+  /// is owned by the VPlan and deleted once the VPlan is destroyed.
+  VPRegionBlock *createVPRegionBlock(VPBlockBase *Entry, VPBlockBase *Exiting,
+                                     const std::string &Name = "",
+                                     bool IsReplicator = false) {
+    auto *VPB = new VPRegionBlock(Entry, Exiting, Name, IsReplicator);
+    CreatedBlocks.push_back(VPB);
+    return VPB;
+  }
+
+  /// Create a new VPRegionBlock with \p Name and entry and exiting blocks set
+  /// to nullptr. If \p IsReplicator is true, the region is a replicate region.
+  /// The returned block is owned by the VPlan and deleted once the VPlan is
+  /// destroyed.
+  VPRegionBlock *createVPRegionBlock(const std::string &Name = "",
+                                     bool IsReplicator = false) {
+    auto *VPB = new VPRegionBlock(Name, IsReplicator);
+    CreatedBlocks.push_back(VPB);
+    return VPB;
+  }
+
+  /// Create a VPIRBasicBlock from \p IRBB containing VPIRInstructions for all
+  /// instructions in \p IRBB, except its terminator which is managed in VPlan.
----------------
ayalz wrote:

```suggestion
  /// instructions in \p IRBB, except its terminator.
```
(the block is managed in VPlan, as explained next, rather than its terminator).

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