RFR: 8003348: SA can not read core file on OS X

[Yumin Qi]

Hi,

     Please review for the changes for SA to read core file on Mac OS X, 
this is feature is not implemented on previous releases.
     This change made for SA to work on core file on Darwin, but still 
some function not fixed, such as 'pstack'. This is intended to integrate 
into 8.

      http://cr.openjdk.java.net/~minqi/8003348/

      Please take some time since the code change is a little bigger.

Thanks very much
Yumin