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

[Severin Gehwolf]

On Fri, 2019-01-11 at 22:37 +0900, Yasumasa Suenaga wrote:
> 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].

This looks good to me and fixes the issue with jdk_jfr tests asserting
in fastdebug with GCC 8. I'm not a *Reviewer*, though.

Thanks,
Severin

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