[llvm] r236267 - Simplify the creation of compressed debug sections.

[Rafael Espíndola]

> Awesome, thanks a bunch!
>
> It was pretty confusing figuring out how to do this when I implemented it -
> creating fragments, etc.

Yes, the old ELF writer code was really convoluted. In big part it was
my fault, the early ELF in MC prototype grew to what we had without
ever getting a rewrite.

Cheers,
Rafael