[PATCH] [ARM, Fix] Fix emitLeading/TrailingFence on old ARM processors

[Robin Morisset]

Thanks jf for catching this forgotten test!

It turned out that this code is dead, as these subtargets completely avoid this
code path anyway. I have replaced it by llvm_unreachable, and it is tested by
the ARMv4 test in atomic-load-store.

http://reviews.llvm.org/D5304

Files:
  lib/Target/ARM/ARMISelLowering.cpp
  lib/Target/ARM/ARMISelLowering.h
  test/CodeGen/ARM/atomic-load-store.ll
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