[lld] [LLD][COFF] Fix importing DllMain from import libraries (PR #146610)

[Martin Storsjö via llvm-commits]

mstorsjo wrote:

> I opened #147152 to address your comments @mstorsjo. If instead you'd prefer me to revert [this commit](https://github.com/llvm/llvm-project/commit/e63de82d904c2364c84489894eeb81fb9c08a023), and re-open a new PR I can do that too.

Nah, no need to revert - your incremental fix looks mostly good, just one comment on it.

https://github.com/llvm/llvm-project/pull/146610