[PATCH] [MachO] Implement -order_file as a separate ordering pass.

[kledzik at apple.com]

All those comparisons in compareAtomSub() are part of the system linker on darwin.  See:

  http://www.opensource.apple.com/source/ld64/ld64-123.2.1/src/ld/passes/order_file.cpp


http://reviews.llvm.org/D7212

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