git: openjdk/loom: fibers: More tests and cleanup

[duke]

Changeset: bc1ede9d
Branch: fibers
Author:    Alan Bateman <alan.bateman at oracle.com>
Date:      2025-05-19 17:27:42 +0000
URL:       https://git.openjdk.org/loom/commit/bc1ede9dfc20eb0025f1d506190aa8f393cd4063

More tests and cleanup

! src/java.base/share/classes/jdk/internal/vm/ThreadDumper.java
! test/jdk/com/sun/management/HotSpotDiagnosticMXBean/DumpThreads.java
! test/lib/jdk/test/lib/threaddump/ThreadDump.java