RFR: 8138832: CreateCoredumpOnCrash on linux ARM causes assert message to be repeated.

[David Lindholm]

Hi,

Please review this patch. The unnecessary wide jlong type were used to 
store a thread_id, even on 32bit platforms. Instead I now use an intptr_t.


Bug: https://bugs.openjdk.java.net/browse/JDK-8138832
Webrev: http://cr.openjdk.java.net/~david/JDK-8138832/webrev.00/

Testing: Passed JPRT and verified that the failing test works now.


Thanks,
David