[PATCH] [lbc++abi] [unwinder] Support Cortex-m0

[Jonathan Roelofs]

Move return instructions into ARM_RETURN macro.
Add ARM_THUMB1_ONLY guard.
Add ARM_HAS_NO_VFP guard.

http://reviews.llvm.org/D5314

Files:
  src/Unwind/UnwindRegistersRestore.S
  src/Unwind/UnwindRegistersSave.S
  src/Unwind/assembly.h
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