[PATCH] [Object, MachO] Don't crash on invalid MachO load segments.

[Alexey Samsonov]

Hi rafael, filcab,

Currently all load segments are parsed in MachOObjectFile constructor.
If the next load segment cannot be parsed, or if command size are too
small, properly report it through the error code and fail to construct
the object, instead of crashing the program.

http://reviews.llvm.org/D10230

Files:
  include/llvm/Object/Error.h
  include/llvm/Object/MachO.h
  lib/Object/Error.cpp
  lib/Object/MachOObjectFile.cpp
  test/Object/macho-invalid.test

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