move call to Classpath::shutDown

We must be in the Active state, not the Exclusive state when calling
this method since it may execute arbitrary Java code.  This fixes an
assertion failure in makeNew.

src/jnienv.cpp

@@ -74,6 +74,11 @@ DetachCurrentThread(Machine* m)
 uint64_t
 destroyJavaVM(Thread* t, uintptr_t*)
 {
+  { ENTER(t, Thread::ActiveState);
+
+    t->m->classpath->shutDown(t);
+  }
+
   // wait for other non-daemon threads to exit
   { ACQUIRE(t, t->m->stateLock);
     while (t->m->liveCount - t->m->daemonCount > 1) {

src/machine.cpp

@@ -3324,8 +3324,6 @@ shutDown(Thread* t)
 
   setRoot(t, Machine::ShutdownHooks, 0);
 
-  t->m->classpath->shutDown(t);
-
   object h = hooks;
   PROTECT(t, h);
   for (; h; h = pairSecond(t, h)) {