[clang] [CIR][CodeGen] Support DesignatedInitUpdateExpr in constant emission (PR #194238)

[Andy Kaylor via cfe-commits]

https://github.com/andykaylor commented:

Thanks for your patience waiting for me to get to this review.

This looks pretty close. I just have a few concerns.

https://github.com/llvm/llvm-project/pull/194238