8216560: gtest build broken on PPC64 and aarch64

Reviewed-by: shade
diff --git a/test/hotspot/gtest/threadHelper.inline.hpp b/test/hotspot/gtest/threadHelper.inline.hpp
index 55bfe6c..b841167 100644
--- a/test/hotspot/gtest/threadHelper.inline.hpp
+++ b/test/hotspot/gtest/threadHelper.inline.hpp
@@ -26,7 +26,7 @@
 
 #include "runtime/mutex.hpp"
 #include "runtime/semaphore.hpp"
-#include "runtime/thread.hpp"
+#include "runtime/thread.inline.hpp"
 #include "runtime/vmThread.hpp"
 #include "runtime/vmOperations.hpp"
 #include "unittest.hpp"