[llvm] [VPlan] Implement cloning of VPlans. (PR #73158)

[via llvm-commits]

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@@ -1200,6 +1271,59 @@ void VPUser::printOperands(raw_ostream &O, VPSlotTracker &SlotTracker) const {
 }
 #endif
 
+VPBlockBase *VPBlockUtils::cloneCFG(
+    VPBlockBase *Entry, DenseMap<VPBlockBase *, VPBlockBase *> &Old2New,
+    DenseMap<VPValue *, VPValue *> &Old2NewVPValues, bool FullRemapping) {
+  ReversePostOrderTraversal<VPBlockShallowTraversalWrapper<VPBlockBase *>> RPOT(
+      Entry);
+  VPBlockBase *NewEntry = nullptr;
+  for (VPBlockBase *BB : RPOT) {
+    VPBlockBase *NewBB = BB->clone();
+    if (!NewEntry)
+      NewEntry = NewBB;
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ayalz wrote:

Set NewEntry to Old2New[Entry], afterwards?

https://github.com/llvm/llvm-project/pull/73158