Fix vthread suspend order to avoid dispatching mount hook for suspend…

…ed thread

Signed-off-by: Jack Lu <[email protected]>

runtime/j9vm/javanextvmi.cpp

@@ -334,23 +334,23 @@ JVM_VirtualThreadMountEnd(JNIEnv *env, jobject thread, jboolean firstMount)
 				J9VMJDKINTERNALVMCONTINUATION_VMREF(currentThread, continuationObj));
 	}
 
-	/* Allow thread to be inspected again. */
-	exitVThreadTransitionCritical(currentThread, threadObj);
-
-	if (firstMount) {
-		TRIGGER_J9HOOK_VM_VIRTUAL_THREAD_STARTED(vm->hookInterface, currentThread);
-	}
-	TRIGGER_J9HOOK_VM_VIRTUAL_THREAD_MOUNT(vm->hookInterface, currentThread);
-
 	/* If isSuspendedByJVMTI is non-zero, J9_PUBLIC_FLAGS_HALT_THREAD_JAVA_SUSPEND is set
 	 * in currentThread->publicFlags while resetting isSuspendedByJVMTI to zero. During
 	 * mount, this suspends the thread if the thread was unmounted when JVMTI suspended it.
 	 */
 	if (0 != J9OBJECT_U32_LOAD(currentThread, threadObj, vm->isSuspendedByJVMTIOffset)) {
-		J9OBJECT_U32_STORE(currentThread, threadObj, vm->isSuspendedByJVMTIOffset, 0);
 		vmFuncs->setHaltFlag(currentThread, J9_PUBLIC_FLAGS_HALT_THREAD_JAVA_SUSPEND);
+		J9OBJECT_U32_STORE(currentThread, threadObj, vm->isSuspendedByJVMTIOffset, 0);
 	}
 
+	/* Allow thread to be inspected again. */
+	exitVThreadTransitionCritical(currentThread, threadObj);
+
+	if (firstMount) {
+		TRIGGER_J9HOOK_VM_VIRTUAL_THREAD_STARTED(vm->hookInterface, currentThread);
+	}
+	TRIGGER_J9HOOK_VM_VIRTUAL_THREAD_MOUNT(vm->hookInterface, currentThread);
+
 	vmFuncs->internalExitVMToJNI(currentThread);
 
 	Trc_SC_VirtualThreadMountEnd_Exit(currentThread, thread, firstMount);