git: openjdk/loom: fibers: Fix build

[duke]

Changeset: 9e92a799
Author:    Ron Pressler <ron.pressler at oracle.com>
Date:      2020-12-04 12:37:36 +0000
URL:       https://git.openjdk.java.net/loom/commit/9e92a799

Fix build

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