Old backing field with dollar is now forbidden

compiler/testData/diagnostics/tests/scopes/kt421Scopes.kt

@@ -1,8 +0,0 @@
-// http://youtrack.jetbrains.net/issue/KT-421
-// KT-421 Strange 'unresolved' bug with backing fields
-
-class A() {
-    val c = 1
-    val a = <!UNINITIALIZED_VARIABLE!>b<!>
-    val b = <!BACKING_FIELD_USAGE_DEPRECATED!>$c<!>  // '$c' is unresolved
-}

compiler/testData/diagnostics/tests/scopes/kt421Scopes.txt

@@ -1,11 +0,0 @@
-package
-
-public final class A {
-    public constructor A()
-    public final val a: kotlin.Int = 1
-    public final val b: kotlin.Int = 1
-    public final val c: kotlin.Int = 1
-    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
-    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
-    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
-}