[LLVMdev] MC ELFObjectWriter backend refactoring

[Rafael Espíndola]

> Heads up: I just lifted some code from X86::RecordRelocation to
> ELFObjectWriter -
> More to follow.

Thanks,
How far do you want to go? I was playing with the idea of factoring
the relocation recording into another class and moving those to
lib/Target/*. That way the ELF writer becomes non-virtual again.

> Thanks,
> -jason

Cheers,
Rafael