Outer's superclass' method is now inaccessible from nested

Also the diagnostic error message reported the wrong nested class name: it
should be the nested class in the hierarchy which is static, not the class of
the scope where we're checking the accessibility

idea/testData/diagnosticMessage/inaccessibleOuterClassExpression.kt

@@ -0,0 +1,7 @@
+class A {
+    class B {
+        val r = object {
+            fun bar() = this@A
+        }
+    }
+}

idea/testData/diagnosticMessage/inaccessibleOuterClassExpression1.txt

@@ -0,0 +1,2 @@
+<!-- inaccessibleOuterClassExpression1 -->
+Expression is inaccessible from a nested class 'B', use 'inner' keyword to make the class inner

idea/tests/org/jetbrains/jet/plugin/highlighter/DiagnosticMessageTest.java

@@ -98,4 +98,8 @@ public class DiagnosticMessageTest extends JetLiteFixture {
     public void testRenderCollectionOfTypes() throws Exception {
         doTest("renderCollectionOfTypes", 1, Errors.EXPECTED_PARAMETERS_NUMBER_MISMATCH);
     }
+
+    public void testInaccessibleOuterClassExpression() throws Exception {
+        doTest("inaccessibleOuterClassExpression", 1, Errors.INACCESSIBLE_OUTER_CLASS_EXPRESSION);
+    }
 }