Make MCSectionELF::AssociatedSection be a link to a symbol, because
that's how it works in the assembly, and use it in the asm printer.
(from D29104) Would AssociatedSymbol ever be null?
should never happen
The parent revision has been submitted, this one is ready.
Rafael, are you OK with this?
I'd really like to submit this some time soon. Any comments?
address Rafael's comments
Committed as r297769