[PATCH] Add a thread-model knob for lowering atomics on baremetal & single threaded systems

[Jon Roelofs]

Follow up on morisset's comments.

http://reviews.llvm.org/D4984

Files:
  include/llvm/CodeGen/CommandFlags.h
  include/llvm/Target/TargetOptions.h
  lib/Target/ARM/ARMISelLowering.cpp
  lib/Target/ARM/ARMTargetMachine.cpp
  test/CodeGen/ARM/atomic-op.ll
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