[clang] Fix false negative when value initializing a field annotated with [[clang::require_field_initialization]] (PR #124329)

[via cfe-commits]

higher-performance wrote:

> Sorry for the delayed review, this fell off my radar this week! :-/
> 
> Changes LGTM! The release branch did get cut, so this would need to be backported (https://releases.llvm.org/19.1.0/docs/GitHub.html#backporting-fixes-to-the-release-branches).

Ah okay no worries, thanks! So I guess you'll need to merge this into mainline and then I can make a PR to backport it?

https://github.com/llvm/llvm-project/pull/124329