llvm-project

45b5cc08 - [Clang] Fix the warning group of several compatibilty diagnostics (#138872)

[Clang] Fix the warning group of several compatibilty diagnostics (#138872) There are a few diagnostics that are incorrectly grouped under `-Wc++20-compat` instead of `-Wpre-c++20-compat`. I grepped for any remaining `-Wc++xy-compat` diagnostics, but they all seem to actually be about compatibility with C++XY. Fixes #138775.