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

[Alexey Samsonov]

In http://reviews.llvm.org/D10111#180753, @loladiro wrote:

> Would it be sensible to use ErrorOr instead of adding an out parameter?


`std::error_code` is consistent with ObjectFile interface. See `include/llvm/Object/ObjectFile.h`: we use `std::error_code` in accessors like `ObjectFile::getSymbolAddress()`, and only use `ErrorOr` in factories.


http://reviews.llvm.org/D10111

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