[11u] RFR 8250928: JFR: Improve hash algorithm for stack traces

[Aleksey Shipilev]

On 9/1/20 10:52 AM, Jaroslav Bachorík wrote:
> I would like to request a backport of this fix improving the hashing
> function and reducing the chance of conflict in storing JFR stacktrace
> data.
> 
> JIRA: https://bugs.openjdk.java.net/browse/JDK-8250928
> Webrev: http://cr.openjdk.java.net/~jbachorik/8250928/11u/

I have the same concern here as for 8u backport [1].

There are two places where the hash code is computed. While 11u backport matches what mainline does, 
and this is acceptable, this raises a question if mainline really needs to have those two hash codes 
computed the same way. And if so, does backporting the only one of the computations break anything?

-- 
Thanks,
-Aleksey

[1] https://mail.openjdk.java.net/pipermail/jdk8u-dev/2020-September/012603.html