llvm-project

267ab1cf - [clang] Add test for CWG190 "Layout-compatible POD-struct types" (#121668)

[clang] Add test for CWG190 "Layout-compatible POD-struct types" (#121668) This patch adds test for [CWG190](https://cplusplus.github.io/CWG/issues/190.html), leveraging `__is_layout_compatible` intrinsic added for C++20 `std::is_layout_compatible`. I conservatively set the status to Clang 19, as it's the first release that implemented said intrinsic.