[clang] [clang-tools-extra] Reapply "[Clang] Unify interface for accessing template arguments as written for class/variable template specializations (#81642)" (PR #91393)

[Adrian Prantl via cfe-commits]

adrian-prantl wrote:

Interesting. I though that the check-lldb target would clean the module cache before each run?

https://github.com/llvm/llvm-project/blob/fcfc15b7052a311b7a045e2c6bd26fb5d0b7122c/lldb/test/CMakeLists.txt#L56
https://github.com/llvm/llvm-project/blob/fcfc15b7052a311b7a045e2c6bd26fb5d0b7122c/lldb/test/CMakeLists.txt#L262
https://github.com/llvm/llvm-project/blob/fcfc15b7052a311b7a045e2c6bd26fb5d0b7122c/lldb/test/API/lit.cfg.py#L219

https://github.com/llvm/llvm-project/pull/91393