8387391: hotspot_gc_shenandoah should include gtests

Reviewed-by: xpeng, kdnilsen, wkemper

test/hotspot/jtreg/TEST.groups

@@ -314,7 +314,8 @@ tier1_gc_shenandoah = \
   gc/shenandoah/compiler/ \
   gc/shenandoah/mxbeans/ \
   gc/shenandoah/TestSmallHeap.java \
-  gc/shenandoah/oom/
+  gc/shenandoah/oom/ \
+  gtest/ShenandoahGtests.java
 
 tier2_gc_shenandoah = \
   runtime/MemberName/MemberNameLeak.java \

test/hotspot/jtreg/gtest/ShenandoahGtests.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+/* @test
+ * @summary Run Shenandoah gtests
+ * @library /test/lib
+ * @requires vm.gc.Shenandoah
+ * @requires vm.debug
+ * @run main/native GTestWrapper --gtest_filter=Shenandoah*
+ */