[lld] [LLD][COFF] Handle imported weak aliases consistently (PR #109105)

[Mike Hommey via llvm-commits]

glandium wrote:

I verified that I can (sometimes) get an error with the included testcase on current master, and that the fix makes that go away.

Cc: @mstorsjo 

https://github.com/llvm/llvm-project/pull/109105