am a2ab2ac3: Merge change 5636 into donut

Merge commit 'a2ab2ac35e646a9a7ce25140c81783ea5991b8b2'

* commit 'a2ab2ac35e646a9a7ce25140c81783ea5991b8b2':
  Add support for LOCAL_ARM_MODE and .arm source file name suffix.