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

[Krystian Stasiowski via cfe-commits]

sdkrystian wrote:

@wlei-llvm Not a known issue... could you provide a repro? I'll look into this in the meantime.

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