git: openjdk/loom: fibers: Fix preemption after changes to transitions in JDK-8272526

[duke]

Changeset: b219b912
Author:    Ron Pressler <ron.pressler at oracle.com>
Date:      2021-08-27 19:02:38 +0000
URL:       https://git.openjdk.java.net/loom/commit/b219b9123eb2bb55b788b641bcd940bde1fd4f94

Fix preemption after changes to transitions in JDK-8272526

! src/hotspot/share/runtime/continuation.cpp
! src/hotspot/share/runtime/continuation.hpp
! src/hotspot/share/runtime/stubRoutines.cpp
! src/hotspot/share/runtime/stubRoutines.hpp
! src/hotspot/share/runtime/thread.cpp