Using LLD as FreeBSD's system linker

I think this is worth more attention, so forwarding to llvm-dev.

https://llvm.org/bugs/show_bug.cgi?id=23214#c40

Ed succeeded to link the entirety of the FreeBSD/amd64 base system (userland world and kernel) with LLD. I think this is a great milestone for both FreeBSD and LLVM/LLD communities!

Congratulations! This is a big milestone.

– Sean Silva