[clang] [llvm] [llvm][ADT] Make ImmutableList conform the fwd iterator concept (PR #202580)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- clang/lib/StaticAnalyzer/Checkers/BlockInCriticalSectionChecker.cpp llvm/include/llvm/ADT/ImmutableList.h llvm/unittests/ADT/ImmutableListTest.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/ImmutableList.h b/llvm/include/llvm/ADT/ImmutableList.h
index da5054549..24a4b732c 100644
--- a/llvm/include/llvm/ADT/ImmutableList.h
+++ b/llvm/include/llvm/ADT/ImmutableList.h
@@ -98,7 +98,11 @@ public:
     iterator(ImmutableList l) : L(l.getInternalPointer()) {}
 
     iterator& operator++() { L = L->getTail(); return *this; }
-    iterator operator++(int) { iterator Tmp = *this; ++*this; return Tmp; }
+    iterator operator++(int) {
+      iterator Tmp = *this;
+      ++*this;
+      return Tmp;
+    }
     bool operator==(const iterator& I) const { return L == I.L; }
     bool operator!=(const iterator& I) const { return L != I.L; }
     const value_type& operator*() const { return L->getHead(); }

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https://github.com/llvm/llvm-project/pull/202580