backing fields resolve changed

KT-462 Consider allowing initializing properties via property names when it is safe
KT-598 Allow to use backing fields after this expression

idea/testData/checker/Properties.jet

@@ -14,7 +14,7 @@
 
 class Test() {
     var a : Int = 111
-    var b : Int get() = <error>$a</error>; set(x) {a = x; <error>$a</error> = x}
+    var b : Int get() = $a; set(x) {a = x; $a = x}
 
    this(i : Int) : this() {
     <error>$b</error> = $a
@@ -22,7 +22,7 @@ class Test() {
     a = <error>$b</error>
    }
    fun f() {
-    <error>$b</error> = <error>$a</error>
+    <error>$b</error> = $a
     a = <error>$b</error>
    }
 }

idea/testData/quickfix/variables/changeToBackingField/afterBFRequired.kt

@@ -1,6 +1,7 @@
 // "Change reference to backing field" "true"
 class A() {
-    val a : Int
+    var a : Int
+    set(v) {}
     {
         <caret>$a = 1
     }

idea/testData/quickfix/variables/changeToBackingField/afterKt510.kt

@@ -1,7 +1,8 @@
 // "Change reference to backing field" "true"
 public open class Identifier() {
     var field : Boolean
+    set(v) {}
     {
-        <caret>$field = false;
+        <caret>this.$field = false;
     }
 }

idea/testData/quickfix/variables/changeToBackingField/beforeBFRequired.kt

@@ -1,6 +1,7 @@
 // "Change reference to backing field" "true"
 class A() {
-    val a : Int
+    var a : Int
+    set(v) {}
     {
         <caret>a = 1
     }

idea/testData/quickfix/variables/changeToBackingField/beforeKt510.kt

@@ -1,6 +1,7 @@
 // "Change reference to backing field" "true"
 public open class Identifier() {
     var field : Boolean
+    set(v) {}
     {
         <caret>this.field = false;
     }