KT-4825 Implement "synchronized" properly via monitorenter/monitorexit

#KT-4825 Fixed

compiler/testData/codegen/boxWithStdlib/fullJdk/synchronized/nestedDifferentObjects.kt

@@ -0,0 +1,13 @@
+fun box(): String {
+    val obj = "" as java.lang.Object
+    val obj2 = "1" as java.lang.Object
+
+    synchronized (obj) {
+        synchronized (obj2) {
+            obj.wait(1)
+            obj2.wait(1)
+        }
+    }
+
+    return "OK"
+}