[clang] [clang-tools-extra] [lldb] [clang] implement CWG1558 and CWG2064: instantiation-dependency improvements (PR #190495)

[Vlad Serebrennikov via cfe-commits]

https://github.com/Endilll commented:

Can you add test for CWG1558 and run `make_cxx_dr_status`?

https://github.com/llvm/llvm-project/pull/190495