git: openjdk/loom: fibers: fix issue with return_barrier, JVMTI CONTINUATION_RUN event and thread state transition

[duke]

Changeset: 322399d3
Author:    Serguei Spitsyn <serguei.spitsyn at oracle.com>
Date:      2020-01-08 19:58:47 +0000
URL:       https://git.openjdk.java.net/loom/commit/322399d3

fix issue with return_barrier, JVMTI CONTINUATION_RUN event and thread state transition

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