[clang] [clang-tools-extra] [clang] Improve nested name specifier AST representation (PR #147835)

[Matheus Izvekov via cfe-commits]

mizvekov wrote:

> Hi! We are seeing regression in `clang-tidy` in `modernize-type-traits` check #153649. I confirmed locally that on [91cdd35](https://github.com/llvm/llvm-project/commit/91cdd35008e9ab32dffb7e401cdd7313b3461892) it is bugged and commit before it is not [fc44a4f](https://github.com/llvm/llvm-project/commit/fc44a4fcd3c54be927c15ddd9211aca1501633e7)

Thanks for reporting. This has been fixed by https://github.com/llvm/llvm-project/pull/153923

https://github.com/llvm/llvm-project/pull/147835