JET-16 Check property initializers as parts of the primary constructor's body

idea/testData/codegen/privateVal.jet

@@ -1,3 +1,3 @@
-class PrivateVal {
+class PrivateVal() {
   private val prop = 0;
 }

idea/testData/codegen/privateVar.jet

@@ -1,4 +1,4 @@
-class PrivateVar {
+class PrivateVar() {
   private var x = 0;
 
   fun setValueOfX(aValue: Int) { x = aValue }