hg: jdk/sandbox: 8223534: add back fixed test_markOop.cpp

[chris.hegarty at oracle.com]

Changeset: cc6053cbd811
Author:    coleenp
Date:      2019-05-08 13:22 -0400
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/cc6053cbd811

8223534: add back fixed test_markOop.cpp
Summary: The test needed wait_with_safepoint_check in the main thread.
Reviewed-by: dcubed

+ test/hotspot/gtest/oops/test_markOop.cpp