git: openjdk/loom: fibers: Test cleanup

[duke]

Changeset: 30b0486d
Author:    Alan Bateman <alan.bateman at oracle.com>
Date:      2023-10-01 08:06:12 +0000
URL:       https://git.openjdk.org/loom/commit/30b0486d60f5abd864a82386df928e6852e4600f

Test cleanup

! src/java.base/share/classes/java/lang/VirtualThread.java
! test/jdk/java/lang/Thread/virtual/MonitorEnterReleasesCarrier.java
! test/jdk/java/lang/Thread/virtual/MonitorEnterWhenPinned.java
! test/jdk/java/lang/Thread/virtual/MonitorUnblocking.java
! test/jdk/java/lang/Thread/virtual/MonitorsAndParking.java