git: openjdk/loom: fibers: Add VerifyContinuation flag

[duke]

Changeset: ddfa4b2a
Author:    Ron Pressler <ron.pressler at oracle.com>
Date:      2020-10-01 17:52:34 +0000
URL:       https://git.openjdk.java.net/loom/commit/ddfa4b2a

Add VerifyContinuation flag

! src/hotspot/cpu/x86/continuation_x86.inline.hpp
! src/hotspot/share/runtime/continuation.cpp
! src/hotspot/share/runtime/globals.hpp