Containing declaration elimination (#225)

* rewrote AbstractClosureAnnotator not using containingDeclaration

* bug fix

* bug fix

* review fixes + tests

* review fixes

* refactoring

* fix

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

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