[clang] [analyzer] Fix uninitialized base class with initializer list when ctor is not declared in the base class (#70464) (PR #70792)

[Balazs Benics via cfe-commits]

https://github.com/steakhal approved this pull request.

Looks great!

FYI when submitting patches to GH try not to force-push to help the UI for following lines having comments. Otherwise, they will be marked as "outdated" and become hard to dig up and relate to new line locations. This was easy this time, as the size of the PR was minimal (as it should be).

After the PR is approved and all conversations resolved; the author can either manually force-push to squash the commits or use the "squash-merge" to let GH do it.

https://github.com/llvm/llvm-project/pull/70792