RFR(s): 8076012 - SA don't support flags of type size_t

[Jesper Wilhelmsson]

Hi,

Please review this fix for the serviceability agent to support flags of type size_t.

Bug: https://bugs.openjdk.java.net/browse/JDK-8076012
Webrev: http://cr.openjdk.java.net/~jwilhelm/8076012/webrev.00/

This bug is currently blocking the GC repository from being synced with main 
after the change to make a bunch of flags size_t.

The reason it wasn't found when doing that change was that the tests that now 
failed in our nightly testing needs privileged access to be able to attach to 
the test process. If it doesn't have the needed privileges the tests simply 
exits and reports a success. Local testing therefor did not see this as a failure.
Why the tests aren't run in JPRT I don't know. I thought they were. (Or maybe 
they are but without the proper privileges.)

Thanks!
/Jesper