implementation classes implement JetObject; initial implementation of getTypeInfo() method and typeof operator

idea/testData/codegen/typeInfo/getTypeInfo.jet

@@ -0,0 +1,4 @@
+class Point() {
+}
+
+fun foo() = new Point()

idea/testData/codegen/typeInfo/typeOfOperator.jet

@@ -0,0 +1,7 @@
+class Point() {
+}
+
+fun foo() {
+  val p = new Point();
+  return typeof(p);
+}