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

[Arthur Eubanks via cfe-commits]

aeubanks wrote:

fyi this uncovered some mismatching struct/class declarations, which affects mangling in the MSVC C++ ABI, leading to linker undefined symbol errors. unsure why we weren't seeing this before this change

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