RFR: 8265750: Fatal error in safepoint.cpp after backport of 8258414

[Severin Gehwolf]

On Fri, 2021-04-23 at 17:43 +0200, Jaroslav Bachorík wrote:
> Please, review this backout patch for a backport causing fatal error.
> 
> JIRA: https://bugs.openjdk.java.net/browse/JDK-8265750
> Webrev: http://cr.openjdk.java.net/~jbachorik/8265750/webrev/
> 
> The backout changes also revert the change introduced by
> https://bugs.openjdk.java.net/browse/JDK-8265718 as the affected code
> is not present any more.
> 
> Tier 1 tests are passing on linux x64 but I have no windows machine
> ready for JDK build and tests (as was obvious from the breakage ...).
> So, if someone could do a test run on windows x64 (at least) I would
> greatly appreciate it.

I'm not sure this is the right bug to use. If JDK-8265750 is going to
be a backout of JDK-8258414 in jdk head, then this would be OK. If this
is an OpenJDK 11.0.12 only problem it would be OK too, but the bug
doesn't say (it should say so if so). What was the course of action in
jdk 17 and jdk 16?

Thanks,
Severin