[llvm] [MachineOutliner] Leaf Descendants (PR #90275)

[Ellis Hoag via llvm-commits]

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@@ -105,6 +114,68 @@ void SuffixTree::setSuffixIndices() {
   }
 }
 
+void SuffixTree::setLeafNodes() {
+  // A stack that keeps track of nodes to visit for post-order DFS traversal.
+  std::stack<SuffixTreeNode *> ToVisit;
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ellishg wrote:

Are their any advantages to using `std::stack` rather than `SmallVector`? You can use `SmallVector::pop_back_val()` and `SmallVector::push_back()`.

https://github.com/llvm/llvm-project/pull/90275