Containing declaration elimination (#225)

* rewrote AbstractClosureAnnotator not using containingDeclaration

* bug fix

* bug fix

* review fixes + tests

* review fixes

* refactoring

* fix

backend.native/tests/codegen/localClass/noPrimaryConstructor.kt

@@ -0,0 +1,21 @@
+fun box(s: String): String {
+    class Local {
+        constructor(x: Int) {
+            this.x = x
+        }
+
+        constructor(z: String) {
+            x = z.length
+        }
+
+        val x: Int
+
+        fun result() = s
+    }
+
+    return Local(42).result() + Local("zzz").result()
+}
+
+fun main(args : Array<String>) {
+    println(box("OK"))
+}