[clang] [Clang] add emit -Wignored-base-class-qualifiers diagnostic for cv-qualified base classes (PR #132116)

[Lyle Dean via cfe-commits]

lyledean1 wrote:

> It isn't clear what the merge conflicts are (github won't tell me for some reason?) but those need fixing before we can merge this.

It was on the release notes, that's fixed now 

https://github.com/llvm/llvm-project/pull/132116