RFR: 8216486: Possibility of integer overflow in JfrThreadSampler::run()

[Yasumasa Suenaga]

Hi all,

Please review this change.
This change passed all tests on submit repo and jdk_jfr jtreg tests.

   JBS: https://bugs.openjdk.java.net/browse/JDK-8216486
   webrev: http://cr.openjdk.java.net/~ysuenaga/JDK-8216486/webrev.00/


Severin and I have discussed about this issue on [1].


Thanks,

Yasumasa


[1] https://mail.openjdk.java.net/pipermail/hotspot-jfr-dev/2019-January/000321.html