RFR: 8321225: [JVMCI] HotSpotResolvedObjectTypeImpl.isLeafClass shouldn't create strong references

[Tobias Hartmann]

On Mon, 4 Dec 2023 05:36:38 GMT, Tom Rodriguez <never at openjdk.org> wrote:

> Checking for leaf Klasses requires seeing if the subklass field is null.  As part of the fix for JVMCI support for ZGC, JDK-8299229, it was changed to call into the runtime which had the side effect of creating a strong reference to an the class.  Since it's only checking for non-null it's ok to just perform thread directly as was done prior to JDK-8299229.  This avoids causing class unloading problems.

Looks reasonable to me.

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Marked as reviewed by thartmann (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/16943#pullrequestreview-1762631218