FIR: introduce delegate field initializers

Before this commit we initialized delegate fields in primary constructor,
that could provoke NPE in case delegate is used in initializer of
some property backing field.
Now we initialize delegate fields directly instead.

compiler/testData/ir/irText/firProblems/Fir2IrClassifierStorage.kt.txt

@@ -0,0 +1,65 @@
+class FirSession {
+  constructor(name: String) /* primary */ {
+    super/*Any*/()
+    /* <init>() */
+
+  }
+
+  val name: String
+    field = name
+    get
+
+}
+
+interface Fir2IrComponents {
+  abstract val session: FirSession
+    abstract get
+
+  abstract val classifierStorage: Fir2IrClassifierStorage
+    abstract get
+
+}
+
+class Fir2IrComponentsStorage : Fir2IrComponents {
+  constructor(session: FirSession) /* primary */ {
+    super/*Any*/()
+    /* <init>() */
+
+  }
+
+  override val session: FirSession
+    field = session
+    override get
+
+  override lateinit var classifierStorage: Fir2IrClassifierStorage
+    override get
+    open set
+
+}
+
+class Fir2IrClassifierStorage : Fir2IrComponents {
+  constructor(components: Fir2IrComponents) /* primary */ {
+    super/*Any*/()
+    /* <init>() */
+
+  }
+
+  private val components: Fir2IrComponents
+    field = components
+    private get
+
+  override val classifierStorage: Fir2IrClassifierStorage
+    override get(): Fir2IrClassifierStorage {
+      return <this>.#components.<get-classifierStorage>()
+    }
+
+  override val session: FirSession
+    override get(): FirSession {
+      return <this>.#components.<get-session>()
+    }
+
+  private val name: String
+    field = <this>.<get-session>().<get-name>()
+    private get
+
+}