[llvm] r219829 - Correctly handle references to section symbols.

[Rafael Espíndola]

> I compared the DSOs built with and without this patch, and found that
> although the size of .ctor sections are the same, the bad DSO contains
> repetition. So some constructors are called more than once (and probably
> some are not called at all). That seems the direct cause of the issue.
>
> The test is gigantic and having a lot of dependencies. It takes a little bit
> more time to understand what's going on there.

Is it open source? I would be more than happy to help reduce it.

Cheers,
Rafael