[clang] [clang-tools-extra] [clang] Complete fields in __builtin_offsetof designators (PR #195126)

[Jakob Linke via cfe-commits]

schuay wrote:

> Please disclose AI usage in PR description.
> 
> https://llvm.org/docs/AIToolPolicy.html

Will do, wasn't aware of this.

https://github.com/llvm/llvm-project/pull/195126