[clang] [Clang][Sema] Fix crash when using name of UnresolvedUsingValueDecl with template arguments (PR #83842)

[Erich Keane via cfe-commits]

erichkeane wrote:

> Updated with new fix (still need a release note)

Please update the patch message in github (which should allow editing) to reflect the new approach.

https://github.com/llvm/llvm-project/pull/83842