Join with assignment: place the result at the assignment

#KT-21172 Fixed

idea/testData/intentions/joinDeclarationAndAssignment/deleteConstructorBlock2.kt

@@ -0,0 +1,8 @@
+// DISABLE-ERRORS
+class A(i: Int, j: Int) {
+    constructor(i: Int) : this(i, 2) {
+        a = 1
+    }
+
+    val a<caret>: Int
+}