[llvm] [LTO] Add function alias as function instead of data (PR #112599)

[Steven Wu via llvm-commits]

cachemeifyoucan wrote:

I would prefer a test case for this. I think the goal is to get attribute set correctly when querying from LTO legacy interface? I will just extend `llvm-lto -list-symbols-only` option to print attributes too to test your change.

https://github.com/llvm/llvm-project/pull/112599