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

[Ella Ma via cfe-commits]

Snape3058 wrote:

Do I need to
* create a new PR?
* push directly to this PR on the original branch `Snape3058:issue-70464`?
* commit directly without revision?

Which operation is correct?

(Sorry for not familiar with GitHub) -(

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