[lld] r278550 - [ELF] - Fix for: error "invalid section index: xxx" when linking FreeBSD kernel.

[Rafael Espíndola via llvm-commits]

> As far as I'm concerned if we want to revert the change it's easy
> enough to just disable those drivers for now (until they're rebuilt)
> in order to continue testing lld. Perhaps others have cases that
> aren't easily worked around though?

I would be surprised if there was any other source of files that look
like this other than the old gas bug.

It is probably less work to keep this hack in until we can fully build
freebsd and then try to rebuild those drivers.

Cheers,
Rafael