[llvm] [ADT] Fix MSVC build after iterator C++20 fix (PR #173495)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h -- llvm/include/llvm/ADT/iterator.h --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/iterator.h b/llvm/include/llvm/ADT/iterator.h
index 744440950..5d129ea9f 100644
--- a/llvm/include/llvm/ADT/iterator.h
+++ b/llvm/include/llvm/ADT/iterator.h
@@ -96,7 +96,6 @@ public:
   };
 
 protected:
-
   /// A proxy object for computing a reference via indirecting a copy of an
   /// iterator. This is used in APIs which need to produce a reference via
   /// indirection but for which the iterator object might be a temporary. The

``````````

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https://github.com/llvm/llvm-project/pull/173495