git: openjdk/loom: fibers: refix for return_barrier and JVMTI CONTINUATION_RUN event issue

[duke]

Changeset: 06136430
Author:    Serguei Spitsyn <serguei.spitsyn at oracle.com>
Date:      2020-01-08 20:57:39 +0000
URL:       https://git.openjdk.java.net/loom/commit/06136430

refix for return_barrier and JVMTI CONTINUATION_RUN event issue

! src/hotspot/share/runtime/continuation.cpp