[llvm] [VPlan] Simplify the computation of the block entry mask. (PR #173265)

[Mel Chen via llvm-commits]

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@@ -268,6 +284,7 @@ VPlanTransforms::introduceMasksAndLinearize(VPlan &Plan, bool FoldTail) {
   VPBasicBlock *Header = LoopRegion->getEntryBasicBlock();
   ReversePostOrderTraversal<VPBlockShallowTraversalWrapper<VPBlockBase *>> RPOT(
       Header);
+  VPPostDominatorTree VPPDT(Plan);
   VPPredicator Predicator;
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Mel-Chen wrote:

813c2084b97cb62dd28d63a6dde3deeb8d1a813a

https://github.com/llvm/llvm-project/pull/173265