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

[kledzik at apple.com]

Sure two passes is conceptually clean, but if it turns out that running sort() twice for mach-o makes linking slower for mach-o than it currently is, then that is not ideal.

The other way would be to have one layout pass that uses a base class for the comparator which the ELF layout pass uses as-is, but there is a (non virtual) way for mach-o to supply a more complex comparator (today's comparator).


http://reviews.llvm.org/D7212

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