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

[David Spickett via cfe-commits]

DavidSpickett wrote:

https://github.com/llvm/llvm-project/pull/152993 fixes this.

Pretty sure there's no problem with this PR, it uncovered an existing problem in the formatter itself.

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