[PATCH] [Object] Split the ELF interface into 3 parts.

[Rafael Espíndola]

> Personally, the alias_begin style is the only convention that I (explicitly)
> remember ever seeing anywhere in the codebase to indicate STL-like
> semantics. All of the core LLVM classes use this style (Value::use_begin,
> Function::arg_begin, etc.); I don't see any reason to deviate.

That is true. Looks like only Object uses begin_* and misc things
(YAMLTraits) use beginFoo.

What about relocation_begin?

> -- Sean Silva

Cheers,
Rafael