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

[kledzik at apple.com]

There maybe lots of other parts of this LayoutPass that mach-o needs but ELF does not.  Why not just prune away at this until you get pass that is fast enough for ELF.  Then split this in to two passes.  One for mach-o and one for ELF, and let the drivers choose the pass to use.


http://reviews.llvm.org/D7212

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