[lld] [llvm] [LLD][COFF] Make unresolved symbol search behavior compliant with MSVC link.exe (PR #85290)

[Alexandre Ganea via llvm-commits]

aganea wrote:

This is ready for review. This has been tested with a two-stage LLVM toolchain, then on a Unreal Engine-based project.

I've also added support for handling `/DEFAULTLIB` (explicitly on the command line, or implicitly pulled from a OBJ file) in the same way as described by the MSVC document.

https://github.com/llvm/llvm-project/pull/85290