[clang] [clang] Make nullability-on-classes more robust to redeclarations (PR #114778)

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``````````bash
git-clang-format --diff 5e75880165553e9afb721239689a9c79ec84a108 58baaccd4849fee2f8f1966de62660cb4c5bfa6d --extensions cpp -- clang/test/SemaCXX/nullability_redecl.cpp clang/lib/AST/Type.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/AST/Type.cpp b/clang/lib/AST/Type.cpp
index a01d7be0ca..6bf2908e66 100644
--- a/clang/lib/AST/Type.cpp
+++ b/clang/lib/AST/Type.cpp
@@ -43,8 +43,8 @@
 #include "llvm/ADT/APSInt.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/FoldingSet.h"
-#include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/SmallVector.h"
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/MathExtras.h"

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https://github.com/llvm/llvm-project/pull/114778