KT-897 Don't allow assignment to a property before it is defined

compiler/testData/codegen/regressions/kt640.jet

@@ -1,15 +1,15 @@
 package demo
 
 public open class Identifier<T>(myName : T?, myHasDollar : Boolean) {
+    private val myName : T?
+    private var myHasDollar : Boolean
+    private var myNullable : Boolean = true
+
     {
         $myName = myName
         $myHasDollar = myHasDollar
     }
 
-    private val myName : T?
-    private var myHasDollar : Boolean
-    private var myNullable : Boolean = true
-
     open public fun getName() : T? {
         return myName
     }

compiler/testData/diagnostics/tests/controlFlowAnalysis/kt897.jet

@@ -0,0 +1,20 @@
+//KT-897 Don't allow assignment to a property before it is defined
+
+package kt897
+
+class A() {
+    {
+        <!INITIALIZATION_BEFORE_DECLARATION!>i<!> = 11
+    }
+    val i : Int? = null // must be an error
+
+    {
+        <!INITIALIZATION_BEFORE_DECLARATION!>j<!> = 1
+    }
+    var j : Int = 2
+
+    {
+        <!INITIALIZATION_BEFORE_DECLARATION!>k<!> = 3
+    }
+    val k : Int
+}