Merge boxWithStdlib testData into box, delete BoxWithStdlib test

compiler/testData/codegen/box/synchronized/changeMonitor.kt

@@ -0,0 +1,25 @@
+// WITH_RUNTIME
+// FULL_JDK
+
+fun box(): String {
+    var obj0 = "0" as java.lang.Object
+    var obj1 = "1" as java.lang.Object
+
+    var v = obj0
+    synchronized (v) {
+        v = obj1
+    }
+    assertThatThreadDoesNotOwnMonitor(obj0)
+
+    return "OK"
+}
+
+fun assertThatThreadDoesNotOwnMonitor(obj: java.lang.Object) {
+    try {
+        obj.wait(1)
+        throw IllegalStateException("Not owning a monitor!")
+    }
+    catch (e: IllegalMonitorStateException) {
+        // OK
+    }
+}