[PATCH] [MachO] Support reading of fat binaries.

[Joey Gouly]

Hi kledzik,

This adds some basic support for reading of fat binaries. I tested this on some system libraries, and it seems to work!

Could mb1 have a better name? mb_original? Not really sure.

The "empty_obj_x86_armv7.txt" file was generated by taking the bytes from the empty_obj_x86 and empty_obj_armv7 tests inside MachONormalizedFileBinaryReaderTests.cpp, turning them into object files and then using lipo to create a fat binary. It seems to have inserted a lot of empty bytes, I'm not sure if I can generate a binary that doesn't have all this padding.

http://llvm-reviews.chandlerc.com/D2537

Files:
  lib/ReaderWriter/MachO/MachONormalizedFile.h
  lib/ReaderWriter/MachO/MachONormalizedFileBinaryReader.cpp
  unittests/MachOTests/MachONormalizedFileBinaryReaderTests.cpp
  unittests/MachOTests/MachONormalizedFileBinaryWriterTests.cpp
  unittests/MachOTests/empty_obj_x86_armv7.txt
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