[llvm] [Analysis][NFC] Store CallbackVH in vector, not in map (PR #184323)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h -- llvm/include/llvm/Analysis/BlockFrequencyInfoImpl.h --diff_from_common_commit
``````````

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``````````diff
diff --git a/llvm/include/llvm/Analysis/BlockFrequencyInfoImpl.h b/llvm/include/llvm/Analysis/BlockFrequencyInfoImpl.h
index b3c48ee02..54f4e70bf 100644
--- a/llvm/include/llvm/Analysis/BlockFrequencyInfoImpl.h
+++ b/llvm/include/llvm/Analysis/BlockFrequencyInfoImpl.h
@@ -1166,8 +1166,7 @@ template <class BT> void BlockFrequencyInfoImpl<BT>::initializeRPOT() {
   LLVM_DEBUG(dbgs() << "reverse-post-order-traversal\n");
   for (auto [Idx, Block] : enumerate(RPOT)) {
     BlockNode Node = BlockNode(Idx);
-    LLVM_DEBUG(dbgs() << " - " << Idx << ": " << getBlockName(Node)
-                      << "\n");
+    LLVM_DEBUG(dbgs() << " - " << Idx << ": " << getBlockName(Node) << "\n");
     Nodes[Block] = Node;
   }
 

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https://github.com/llvm/llvm-project/pull/184323