[lld-macho] Associate each Symbol with an InputFile

[lld-macho] Associate each Symbol with an InputFile

This makes our error messages more informative. But the bigger motivation is for
LTO symbol resolution, which will be in an upcoming diff. The changes in this
one are largely mechanical.

Reviewed By: #lld-macho, smeenai

Differential Revision: https://reviews.llvm.org/D94316