Allow resolve class declarations in class objects

Use INACCESSIBLE_OUTER_CLASS_EXPRESSION error for marking already resolved elements

 #KT-3261 Fixed

compiler/testData/loadKotlin/classObject/InnerClassInClassObject.kt

@@ -0,0 +1,11 @@
+package test
+
+class TestFirst {
+  class object {
+    fun testing(a: InnerClass) = 45
+    fun testing(a: NotInnerClass) = 45
+  }
+
+  inner class InnerClass
+  inner class NotInnerClass
+}