[clang] [clang-tools-extra] [Clang] Unify interface for accessing template arguments as written for class/variable template specializations (PR #81642)

[Krystian Stasiowski via cfe-commits]

sdkrystian wrote:

I added a commit which adds support for matching the `TemplateArgumentLoc`s of explicit specializations directly.

https://github.com/llvm/llvm-project/pull/81642