git: openjdk/loom: fibers: 2 new changesets

[duke]

Changeset: 503d5df0
Author:    Alan Bateman <alan.bateman at oracle.com>
Date:      2020-10-09 09:38:39 +0000
URL:       https://git.openjdk.java.net/loom/commit/503d5df0

@since 1.0 not needed

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

Changeset: b90dcf0c
Author:    Alan Bateman <alan.bateman at oracle.com>
Date:      2020-10-09 15:11:47 +0000
URL:       https://git.openjdk.java.net/loom/commit/b90dcf0c

Improve pinned thread printer to avoid repeated stack traces

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