[clang] [llvm] [IR] Make dead_on_return attribute optionally sized (PR #171712)

[Aiden Grossman via llvm-commits]

boomanaiden154 wrote:

> LGTM. May this land prior to LLVM 22 branching?

I'd prefer to wait given the branch date is in a couple of days. This patch will involve a let of test churn (attribute gets reordered in tests now that it has been adjusted), which might backporting slightly more difficult. It's also not useful until the DSE/Clang changes land, and they're both not through the review process yet.

Thank you for putting together the Alive2 changes for this and for the reviews!

@nikic When you get a chance, do you mind taking a look and letting me know if you have any concerns?

https://github.com/llvm/llvm-project/pull/171712