git: openjdk/loom: fibers: 3 new changesets

[duke]

Changeset: 80ed3560
Author:    Ron Pressler <ron.pressler at oracle.com>
Date:      2020-09-21 12:26:50 +0000
URL:       https://git.openjdk.java.net/loom/commit/80ed3560

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! test/jdk/java/lang/Continuation/Fuzz.java

Changeset: 525d7b23
Author:    Ron Pressler <ron.pressler at oracle.com>
Date:      2020-09-21 21:07:49 +0000
URL:       https://git.openjdk.java.net/loom/commit/525d7b23

Fix empty Thread.getStackTrace for virtual threads

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

Changeset: 003df29c
Author:    Ron Pressler <ron.pressler at oracle.com>
Date:      2020-09-21 21:08:18 +0000
URL:       https://git.openjdk.java.net/loom/commit/003df29c

Add assertions

! src/hotspot/cpu/x86/continuation_x86.inline.hpp
! src/hotspot/share/runtime/continuation.cpp