[llvm] r258298 - [LTO] Fix error reporting when a file passed to libLTO is invalid or non-existent

[Rafael Espíndola via llvm-commits]

> One possible fix could be to create a temporary LLVMContext in
> lto_module_create_in_local_context(), set its diagnostics handler in the
> same
> way LTOContext is set up and then call createInContext() giving it this
> context. I can look if such a solution is feasible in a few days. As
> explained
> above, I think that reverting the patch would only hide the underlying
> problem.

I like it. With it the C++ API would always take an existing context.

Cheers,
Rafael