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

[Shimin Cui via llvm-commits]

scui-ibm wrote:

Thanks @teresajohnson and @cachemeifyoucan for your quick comments and suggestions. I'll extend llvm-lto -list-symbols-only option to print attributes and add a test to test this.

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