Add some regression tests for obsolete issues

Regenerate tests

compiler/testData/diagnostics/tests/inner/outerProtectedMember.kt

@@ -0,0 +1,13 @@
+// KT-2100
+
+trait I {
+    val x : String
+}
+
+class Foo {
+    protected val x : String = ""
+
+    inner class Inner : I {
+        override val x : String = this@Foo.x
+    }
+}