git: openjdk/loom: fibers: make JVMTI notification in afterTerminate() about UnmountEnd conditional

[duke]

Changeset: e68ce6ca
Author:    Serguei Spitsyn <serguei.spitsyn at oracle.com>
Date:      2021-10-25 08:26:38 +0000
URL:       https://git.openjdk.java.net/loom/commit/e68ce6cafaba704df97e11a99978219d962c7194

make JVMTI notification in afterTerminate() about UnmountEnd conditional

! src/java.base/share/classes/java/lang/VirtualThread.java