[llvm] r220608 - Update the error handling of lib/Linker.

[Rafael Espíndola]

>> What about passing an optional diagnostic handler? If nullptr is
>> passed, the system one is used.
>
>
> That could also work. We'd still need an adapter to avoid writing a handler
> function each time.

What do you think of the attached patches?

Cheers,
Rafael
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