RFR: JDK-8175312: SA: clhsdb: Provide an improved heap summary for 'universe' for G1GC

[Jini George]

Hello,

(Including the SVC and GC groups)

Requesting reviews for enabling the clhsdb 'universe' command to print 
out the various G1 regions (along with the type).

JIRA ID:https://bugs.openjdk.java.net/browse/JDK-8175312
Webrev: http://cr.openjdk.java.net/~jgeorge/8175312/webrev.00/index.html

Modifications have been made to display the regions like:

...
Region: 0x00000005c5400000,0x00000005c5600000,0x00000005c5600000:Old
Region: 0x00000005c5600000,0x00000005c5800000,0x00000005c5800000:Old
Region: 0x00000005c5800000,0x00000005c5a00000,0x00000005c5a00000:Old
Region: 0x00000005c5a00000,0x00000005c5c00000,0x00000005c5c00000:Old
Region: 0x00000005c5c00000,0x00000005c5c00000,0x00000005c5e00000:Free
Region: 0x00000005c5e00000,0x00000005c5e00000,0x00000005c6000000:Free
Region: 0x00000005c6000000,0x00000005c6200000,0x00000005c6200000:Old
...

The jtreg test at this point does not include any testing for the 
display of archived or pinned regions. The testing for this will be 
added once JDK-8174994 is resolved.

The SA tests pass with jprt and Mach5.

Thanks,
Jini.