[llvm] [llvm][IR] Add per-global code model attribute (PR #72077)

[via llvm-commits]

heiher wrote:

> Hi @heiher, you can push additional "fixup" commits to address review comments instead of force pushing. These multiple commits in one PR will be squashed before getting merged. https://llvm.org/docs/GitHub.html#updating-pull-requests

Okay. Thanks for the tip.

https://github.com/llvm/llvm-project/pull/72077