git: openjdk/loom: fibers: Windows build issue

[duke]

Changeset: 1d67d882
Author:    Alan Bateman <alan.bateman at oracle.com>
Date:      2020-05-28 10:31:15 +0000
URL:       https://git.openjdk.java.net/loom/commit/1d67d882

Windows build issue

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