git: openjdk/loom: fibers: Fix failing forced preempt tests.

[duke]

Changeset: 45377bea
Author:    Ron Pressler <ron.pressler at oracle.com>
Date:      2020-06-16 21:20:48 +0000
URL:       https://git.openjdk.java.net/loom/commit/45377bea

Fix failing forced preempt tests.

! src/hotspot/cpu/x86/continuation_x86.inline.hpp
! src/hotspot/cpu/x86/stubGenerator_x86_64.cpp
! src/hotspot/share/runtime/continuation.cpp
! src/hotspot/share/runtime/thread.cpp
! test/jdk/ProblemList.txt
! test/jdk/java/lang/Continuation/Preempt.java
! test/jdk/java/lang/Continuation/java.base/java/lang/PreemptLiveFrames.java