KT-16904 Wrong IR when applying some operators to superclass properties in constructor

Use property accessors for assignment generation for inherited properties in constructor.

compiler/testData/ir/irText/expressions/kt16904.kt

@@ -0,0 +1,30 @@
+// FILE: J.java
+
+public class J {
+    public int field = 0;
+}
+
+// FILE: kt16904.kt
+
+abstract class A {
+    val x = B()
+    var y = 0
+}
+
+class B {
+    operator fun plusAssign(x: Int) {
+    }
+}
+
+class Test1 : A {
+    constructor() {
+        x += 42
+        y += 42
+    }
+}
+
+class Test2 : J() {
+    init {
+        field = 42
+    }
+}