am 2c4676de: am 93b0cb40: Define inline atomic operations for x86 and ARM.

Merge commit '2c4676de62cf8ca7e3759f7f709e29c623495f55'

* commit '2c4676de62cf8ca7e3759f7f709e29c623495f55':
  Define inline atomic operations for x86 and ARM.