@lhames agreed to remove the existing Mach-O port from lld
(https://reviews.llvm.org/D75382#1906108), but we should probably
continue keeping it until the new Mach-O port gets matured. The existing
Mach-O is also used by some downstream projects like Zig.
But we are going to call the new one as mach_o2 until mach_o can be removed and rename the new one mach_o once it's done, no? If so, I don't think we need to rename only this part at this moment. We can rename them all at once later.