[llvm] [llvm][AArch64] Autoupgrade function attributes from Module attributes. (PR #80640)

[Nikita Popov via llvm-commits]

nikic wrote:

Also, should this upgrade *really* run during normal bitcode reading? It makes little sense to me that *current* bitcode will no longer round-trip between llvm-as / llvm-dis after this change. Should the change here be limited to IRMover only?

https://github.com/llvm/llvm-project/pull/80640