[llvm] How to run a simple Machine Function Pass

[Danna bib]

Hi all,
I'm trying to run a MachineFunction Pass, but it seems running that is more
complicated that running a frontend pass. llvm 3.4 official document [
http://llvm.org/docs/WritingAnLLVMPass.html] only describes writing/running
a front end pass, while running backend passes are completely different.
So, it would be very helpful if someone explains, how one can run a backend
pass step by step.

Thanks,
Danna
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