[PATCH] [Object, MachO] Make MachO parser significantly more robust to invalid inputs.

[Keno Fischer]

I don't really have a strong opinion either way, I just wanted to bring it up as last time I touched this file a strong preference for moving everything to ErrorOr was expressed in the review, because it's easy to ignore the std::error_code.


http://reviews.llvm.org/D10111

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