[llvm] [DominanceFrontier] make iterating dereferenced DominanceFrontierBase::find deterministic (PR #69711)

[Jakub Kuderski via llvm-commits]

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@@ -39,7 +39,7 @@ class raw_ostream;
 template <class BlockT, bool IsPostDom>
 class DominanceFrontierBase {
 public:
-  using DomSetType = std::set<BlockT *>;                // Dom set for a bb
+  using DomSetType = SetVector<BlockT *>;               // Dom set for a bb
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kuhar wrote:

Can you add a comment explaining the choice of  `SetVector`?

https://github.com/llvm/llvm-project/pull/69711