* Added atomic COMPARE_AND_EXCHANGE definition so the locks are actually   manipulated atomically.
* Added atomic COMPARE_AND_EXCHANGE definition so the locks are actually
  manipulated atomically.

  NB. This isn't SMP safe yet - there's no 'lock' prefix in the compare
      instruction here nor in the JIT.

kaffe/kaffe,kaffe/kaffe,kaffe/kaffe,kaffe/kaffe,kaffe/kaffe