8343513: Forward declare Thread in mutexLocker.hpp

Reviewed-by: dholmes, mgronlun, shade

src/hotspot/share/nmt/nmtCommon.hpp

@@ -30,6 +30,7 @@
 #include "memory/allStatic.hpp"
 #include "nmt/memTag.hpp"
 #include "runtime/mutexLocker.hpp"
+#include "runtime/thread.hpp"
 #include "utilities/align.hpp"
 #include "utilities/globalDefinitions.hpp"
 

src/hotspot/share/runtime/mutexLocker.hpp

@@ -28,7 +28,8 @@
 #include "memory/allocation.hpp"
 #include "runtime/flags/flagSetting.hpp"
 #include "runtime/mutex.hpp"
-#include "runtime/thread.hpp"
+
+class Thread;
 
 // Mutexes used in the VM.