am 22f9d880: am 8a0a5274: Add stack unwinding directives to atomic-android-arm.S.

Merge commit '22f9d880941cf1db87fd19437bce71420eedf8bd'

* commit '22f9d880941cf1db87fd19437bce71420eedf8bd':
  Add stack unwinding directives to atomic-android-arm.S.