Added tests on labels

#KT-1703 Fixed
 #KT-361 Fixed
 #KT-3920 Fixed
 #KT-3988 Fixed
 #KT-4247 Fixed
 #KT-4586 Fixed
 #KT-4603 Fixed
 #KT-591 Fixed

compiler/testData/diagnostics/tests/labels/kt4603.kt

@@ -0,0 +1,12 @@
+// !DIAGNOSTICS: -UNUSED_VARIABLE
+//KT-4603 Labeling information is lost when passing through local classes or objects
+
+fun foo() {
+    val s = @l{ Int.() ->
+        class Local(val y: Int = this@l) {
+            fun bar() {
+                val x: Int = this@l //unresolved
+            }
+        }
+    }
+}