RFR (S): 6313383: SA: Update jmap to support HPROF binary format "JAVA PROFILE 1.0.2"

[Fredrik Arvidsson]

Hi

Please help me and review the changes below:

Webrev:http://cr.openjdk.java.net/~allwin/farvidss/6313383/webrev.00/ 
<http://cr.openjdk.java.net/%7Eallwin/farvidss/6313383/webrev.00/>
Bug:https://bugs.openjdk.java.net/browse/JDK-6313383 
<https://bugs.openjdk.java.net/browse/JDK-6313383>

This change adds support for dumping large heaps (> 4G) using jmap by 
implementing the "JAVA PROFILE 1.0.2" file format with segmented heap 
dump records.
The HPROF binary format specification can be found here: 
https://java.net/downloads/heap-snapshot/hprof-binary-format.html.

I added a simple test to verify that heaps smaller than 2G are dumped 
using the "JAVA PROFILE 1.0.1" format. The last section in the test, 
aiming to test the format used when dumping heaps larger than 2G, is 
commented out since the test system didn't like that kind of heap sizes 
and ultimately failed (OOM and sometimes timeout). The test should be 
reintroduced once we can reliably support such tests in the test system.

Thanks 'allwin' for hosting my review :)

Cheers
/Fredrik
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