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

[via llvm-commits]

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@@ -1513,9 +1554,12 @@ void VPSlotTracker::assignNames(const VPlan &Plan) {
 
   ReversePostOrderTraversal<VPBlockDeepTraversalWrapper<const VPBlockBase *>>
       RPOT(VPBlockDeepTraversalWrapper<const VPBlockBase *>(Plan.getEntry()));
-  for (const VPBasicBlock *VPBB :
-       VPBlockUtils::blocksOnly<const VPBasicBlock>(RPOT))
-    assignNames(VPBB);
+  for (const VPBlockBase *VPB : RPOT) {
+    if (auto *VPBB = dyn_cast<VPBasicBlock>(VPB)) {
+      assignNames(VPBB);
+    } else if (auto *CanIV = cast<VPRegionBlock>(VPB)->getCanonicalIV())
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ayalz wrote:

Better be consistent with {}

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