RFR(S) 8080692: lots of jstack tests failing in pit

[Rickard Bäckman]

Hi,

can I please have reviews for this change?
The base used to calculate the address for getting Pairs and Data was wrong in SA.
Also fixes issues with getting the count field. Added more verification
in oopMap.cpp to check that offsets and sizes are correct.

Webrev: http://cr.openjdk.java.net/~rbackman/8080692/
Bug: https://bugs.openjdk.java.net/browse/JDK-8080692

tmtools jstack tests & jprt.

Thanks
/R
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