RFR: 8152955: Many safepoints of "no vm operation" kind

[Roman Kennke]

Am 23.05.2017 um 20:32 schrieb Robbin Ehn:
> Hi all, please review.
>
> When cleanup, safepointalot or vm halt starts a safepoint without an
> operation we now set a reason string for.
>
> Webrev: http://cr.openjdk.java.net/~rehn/8152955/
> Bug: https://bugs.openjdk.java.net/browse/JDK-8152955
>
> Passes hotspot_tier1
>
> Thanks, Robbin

This looks reasonable to me.

(Not a Reviewer)

Roman