RFR(M): 8247515: OSX pc_to_symbol() lookup does not work with core files

[Chris Plummer]

Hello,

Please help review the following:
http://cr.openjdk.java.net/~cjplummer/8247515/webrev.00/index.html
https://bugs.openjdk.java.net/browse/JDK-8247515

The CR contains a description of the issues being addressed. There is 
also no test for this symbol lookup support yet. It will be there after 
I push JDK-8247516 and  JDK-8247514, which are both blocked by the CR.

[1] https://bugs.openjdk.java.net/browse/JDK-8247516
[2] https://bugs.openjdk.java.net/browse/JDK-8247514

thanks,

Chris