[clang] [Clang] Take libstdc++ into account during GCC detection (PR #145056)

[Aaron Ballman via cfe-commits]

https://github.com/AaronBallman commented:

The changes should come with a release note in `clang/docs/ReleaseNotes.rst`, probably in the potentially breaking changes section.

https://github.com/llvm/llvm-project/pull/145056