[clang] [Clang] Fix missing diagnostic for non-standard layout type in `offsetof` (PR #65246)

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``````````bash
git-clang-format --diff 97829935844e7f35216e12c13231f35fbea640c3 b9e201a80ee7e79f8ddfe37fee097b8efddc0a8a -- clang/lib/Sema/SemaExpr.cpp clang/test/SemaCXX/class-layout.cpp clang/test/SemaCXX/ms_struct.cpp clang/test/SemaCXX/offsetof.cpp libcxx/include/__type_traits/datasizeof.h
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View the diff from clang-format here.
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``````````diff
diff --git a/libcxx/include/__type_traits/datasizeof.h b/libcxx/include/__type_traits/datasizeof.h
index cfdd8cbbc..389b006b6 100644
--- a/libcxx/include/__type_traits/datasizeof.h
+++ b/libcxx/include/__type_traits/datasizeof.h
@@ -47,7 +47,8 @@ struct __libcpp_datasizeof {
   };
 #endif
 
-  // _FirstPaddingByte<> is sometimes non-standard layout. Using `offsetof` is UB in that case, but GCC and Clang allow the use as an extension.
+  // _FirstPaddingByte<> is sometimes non-standard layout. Using `offsetof` is UB in that case, but GCC and Clang allow
+  // the use as an extension.
   // TODO : Find a way to replace `offsetof` ?
   _LIBCPP_DIAGNOSTIC_PUSH
   _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Winvalid-offsetof")

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https://github.com/llvm/llvm-project/pull/65246