[clang] [clang-tools-extra] [lldb] [clang] implement CWG1980 and CWG2064: instantiation-dependency improvements (PR #190495)

[Erich Keane via cfe-commits]

https://github.com/erichkeane commented:

So this patch is obviously massive.  However, it SEEMS that much of it is just renaming/fallout from the actual structural changes?  Can we have  a patch for separate review (doesnt' have to build/be separately mergable) that identifies WHAT the actual changes of consequence here are? I don't think I can agree to merge this without a better understanding here, which I can't do with a near-100 file diff.

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