[llvm] [CodeGen] Reland "Use SmallMapVector for SpillPlacement::Node::Links" (PR #196270)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- llvm/include/llvm/ADT/MapVector.h llvm/lib/CodeGen/SpillPlacement.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/include/llvm/ADT/MapVector.h b/llvm/include/llvm/ADT/MapVector.h
index fa52f806c..9185e6221 100644
--- a/llvm/include/llvm/ADT/MapVector.h
+++ b/llvm/include/llvm/ADT/MapVector.h
@@ -359,9 +359,9 @@ void MapVector<KeyT, ValueT, MapType, VectorType, N>::remove_if(Function Pred) {
 /// A MapVector that performs no allocations if smaller than a certain
 /// size.
 template <typename KeyT, typename ValueT, unsigned N>
-struct SmallMapVector
-    : MapVector<KeyT, ValueT, DenseMap<KeyT, unsigned>,
-                SmallVector<std::pair<KeyT, ValueT>, N>, N> {};
+struct SmallMapVector : MapVector<KeyT, ValueT, DenseMap<KeyT, unsigned>,
+                                  SmallVector<std::pair<KeyT, ValueT>, N>, N> {
+};
 
 } // end namespace llvm
 

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https://github.com/llvm/llvm-project/pull/196270