[llvm] [FoldingSet] Invalidate iterators on mutation (PR #218179)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- llvm/include/llvm/ADT/FoldingSet.h llvm/lib/Support/FoldingSet.cpp llvm/unittests/ADT/FoldingSet.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/FoldingSet.h b/llvm/include/llvm/ADT/FoldingSet.h
index 114a689a1..c718ecc5f 100644
--- a/llvm/include/llvm/ADT/FoldingSet.h
+++ b/llvm/include/llvm/ADT/FoldingSet.h
@@ -503,7 +503,9 @@ public:
   using const_iterator = FoldingSetIterator<const T>;
 
   const_iterator begin() const { return const_iterator(this, Buckets); }
-  const_iterator end() const { return const_iterator(this, Buckets + NumBuckets); }
+  const_iterator end() const {
+    return const_iterator(this, Buckets + NumBuckets);
+  }
 
   /// Grow the number of buckets so that we can hold at least \p EltCount
   /// nodes before rebucketing. May allocate more space than requested.

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https://github.com/llvm/llvm-project/pull/218179