self-hosted: build against zig_llvm and embedded LLD

Now the self-hosted compiler re-uses the same C++ code for interfacing
with LLVM as the C++ code.
It also links against the same LLD library files.
6fece14cfbAndrew Kelley committed on 12/27/2017, 12:44:08 AMparent2a25398
22 files changedLine totals unavailable