am 491489bb: am 21ec779a: Add stack unwinding directives to atomic-android-arm.S.

Merge commit '491489bbb89c62df4442afda173e0f953ba84dcb' into eclair-mr2-plus-aosp

* commit '491489bbb89c62df4442afda173e0f953ba84dcb':
  Add stack unwinding directives to atomic-android-arm.S.