[clang] [libcxx] [llvm] [mlir] [compiler-rt] [sanitizer] Skip /include/c++/ from summary (PR #78534)

[Vitaly Buka via cfe-commits]

vitalybuka wrote:

> Note that on Gentoo, this isn't right either, we have e.g.:
> 
> ```
> /usr/lib/gcc/x86_64-pc-linux-gnu/14/include/g++-v14/bits/new_allocator.h
> /usr/lib/gcc/x86_64-pc-linux-gnu/14/include/g++-v14/ext/new_allocator.h
> ```

I guess it's fine to expand the FrameIsInternal to cover Gentoo as well. it looks quite distinct. It would be nice if someone who can test on platform to create a patch. 

For Darwin I don't see what we can do if there is no path at all, hardcode most common c++ headers?

https://github.com/llvm/llvm-project/pull/78534