git: openjdk/loom: fibers: 2 new changesets

[duke]

Changeset: e8828ee1
Author:    Ron Pressler <ron.pressler at oracle.com>
Date:      2020-09-05 12:22:45 +0000
URL:       https://git.openjdk.java.net/loom/commit/e8828ee1

Delimit live stack walker at vthread

! src/hotspot/share/prims/stackwalk.cpp

Changeset: c7145b60
Author:    Ron Pressler <ron.pressler at oracle.com>
Date:      2020-09-05 12:23:10 +0000
URL:       https://git.openjdk.java.net/loom/commit/c7145b60

Refactor

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