[llvm] Revert "[ADT] Deprecate the redirection from SmallSet to SmallPtrSet (Take 2) (#155078) (PR #155622)

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git-clang-format --diff origin/main HEAD --extensions h -- llvm/include/llvm/ADT/SmallSet.h
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``````````diff
diff --git a/llvm/include/llvm/ADT/SmallSet.h b/llvm/include/llvm/ADT/SmallSet.h
index eb434bcb7..7d8c32875 100644
--- a/llvm/include/llvm/ADT/SmallSet.h
+++ b/llvm/include/llvm/ADT/SmallSet.h
@@ -269,7 +269,7 @@ private:
 /// If this set is of pointer values, transparently switch over to using
 /// SmallPtrSet for performance.
 template <typename PointeeType, unsigned N>
-class SmallSet<PointeeType*, N> : public SmallPtrSet<PointeeType*, N> {};
+class SmallSet<PointeeType *, N> : public SmallPtrSet<PointeeType *, N> {};
 
 /// Equality comparison for SmallSet.
 ///

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https://github.com/llvm/llvm-project/pull/155622