[clang] [clang] fix regression printing constructor/destructor names (PR #155688)

[via cfe-commits]

h-vetinari wrote:

> but that is still broken for the constructor names of class templates, since in that case the injected class name type is used, but here the type printer is configured to also print the implicit template arguments.

Should this be a new issue?

https://github.com/llvm/llvm-project/pull/155688