I don't think dmd comes with a COFF64 linker now, users are just told to install Visual Studio or the Windows SDK for a linker. No reason you can't do the same with COFF32. Optlink can stick around with OMF for a couple releases. I suspect nobody would use it when given the choice of COFF32 support.
Anybody seriously programming on Windows uses VS anyway.But at least for 32 bit http://lld.llvm.org/windows_support.html could be packaged.
