[PATCH] Implement emitLeading/TrailingFence in the ARM backend

[Robin Morisset]

Add comment pointing to documentation per jfb request.

I did not point directly to the ARM documentation or barrier cookbook because
it is expressed in terms of the hardware memory model and the mapping to C++11
is not completely obvious. Instead I have linked the webpage that summarizes
the findings of a research group that spent the last decade formalizing/proving
these kind of things. It itself has links to other more primary sources. Is it
enough?

http://reviews.llvm.org/D4960

Files:
  lib/Target/ARM/ARMISelLowering.cpp
  lib/Target/ARM/ARMISelLowering.h
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