[PATCH] [Object, MachO] Cache parsed MachO header in MachOObjectFile. NFC.

[Filipe Cabecinhas]

LGTM.

I'd probably like a comment pointing out that it works because all the (used) members of mach_header and mach_header64 match in size and location.
For people reading the code who aren't familiar with how those headers look, the MachOObjectFile constructor might look weird. (Not a strong want, but I think it might help readability)

Thanks


http://reviews.llvm.org/D10226

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