[lld] r250297 - [ELF2][mips] Support both big and little endian MIPS 32-bit targets

[Rafael Espíndola via llvm-commits]

> That does make sense (and I also agree that addX should be moved from LLD to
> LLVM).

Not sure I would go as far as moving the add functions, but simple to
use read<type, endian> and write<type, endian> do fit in llvm IMHO.

With read and write a templated add becomes really simple.

Cheers,
Rafael