[clang] [llvm] [CIR] Document dynamic exception specification design (PR #222451)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- llvm/include/llvm/ABI/IRTypeMapper.h llvm/include/llvm/ABI/Types.h llvm/lib/ABI/IRTypeMapper.cpp llvm/unittests/ABI/TypesTest.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/ABI/Types.h b/llvm/include/llvm/ABI/Types.h
index ffb223813..b93f0f872 100644
--- a/llvm/include/llvm/ABI/Types.h
+++ b/llvm/include/llvm/ABI/Types.h
@@ -261,9 +261,7 @@ public:
   const VectorType *getVectorType() const { return Vec; }
   unsigned getNumVectors() const { return NumVectors; }
 
-  static bool classof(const Type *T) {
-    return T->getKind() == TypeKind::Tuple;
-  }
+  static bool classof(const Type *T) { return T->getKind() == TypeKind::Tuple; }
 };
 
 struct FieldInfo {

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https://github.com/llvm/llvm-project/pull/222451