[lld] [llvm] [LTO] [LLD] Don't alias the __imp_func and func symbol resolutions (PR #71376)

[Fangrui Song via llvm-commits]

MaskRay wrote:

> [LTO] [LLD] Don't alias the __imp_func and func symbol resolutions

The patch changes the behavior of data symbols as well. Consider adding a test to check its current behavior (I think it's fine whether it makes sense or not; the test just serves as a change detector). I haven't thought hard about data symbols.

https://github.com/llvm/llvm-project/pull/71376