Allow resolve class declarations in class objects

Use INACCESSIBLE_OUTER_CLASS_EXPRESSION error for marking already resolved elements

 #KT-3261 Fixed

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

@@ -0,0 +1,9 @@
+open class PackageTest
+
+class MoreTest() {
+    class object: PackageTest() {
+
+    }
+
+    object Some: PackageTest()
+}