8374233: Overloaded constructor MountUnmountDisabler(jthread thread) is missed

Reviewed-by: amenkov, cjplummer, lmesnik
Backport-of: f5249db

Author: Serguei Spitsyn

src/hotspot/share/runtime/mountUnmountDisabler.cpp

@@ -28,6 +28,7 @@
 #include "prims/jvmtiThreadState.inline.hpp"
 #include "runtime/handles.inline.hpp"
 #include "runtime/javaThread.hpp"
+#include "runtime/jniHandles.hpp"
 #include "runtime/mountUnmountDisabler.hpp"
 #include "runtime/threadSMR.hpp"
 
@@ -193,6 +194,13 @@ void MountUnmountDisabler::end_transition(JavaThread* current, oop vthread, bool
   }
 }
 
+// disable transitions for one virtual thread
+// disable transitions for all threads if thread is nullptr or a platform thread
+MountUnmountDisabler::MountUnmountDisabler(jthread thread)
+  : MountUnmountDisabler(JNIHandles::resolve_external_guard(thread))
+{
+}
+
 // disable transitions for one virtual thread
 // disable transitions for all threads if thread is nullptr or a platform thread
 MountUnmountDisabler::MountUnmountDisabler(oop thread_oop)

src/hotspot/share/runtime/mountUnmountDisabler.hpp

@@ -58,6 +58,7 @@ class MountUnmountDisabler : public AnyObj {
  public:
   MountUnmountDisabler(bool exlusive = false);
   MountUnmountDisabler(oop thread_oop);
+  MountUnmountDisabler(jthread thread);
   ~MountUnmountDisabler();
 
   static int global_vthread_transition_disable_count();