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

[Aiden Grossman via cfe-commits]

boomanaiden154 wrote:

> Looks like there are lots of clang test failures due to the change in attribute order.

Yes. My plan was to update them after approvals and before landing given they are purely mechanical and to avoid mid-air collisions due to test updates/new tests around the same time and to avoid making reviewers here have to look through the 10-20k line diff. If you'd like the test changes up before then, I can do that though.

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