Never report companion object as unused

#KT-11366 Fixed

idea/testData/inspections/unusedSymbol/object/companionObjectBaseMemberUsed.kt

@@ -0,0 +1,19 @@
+class Logger {
+    fun log(){}
+}
+
+abstract class WithLogging {
+    val logger = Logger()
+}
+
+class C {
+    companion object: WithLogging()
+
+    fun foo() {
+        logger.log()
+    }
+}
+
+fun main(args: Array<String>) {
+    C()
+}

idea/testData/inspections/unusedSymbol/object/inspectionData/expected.xml

@@ -35,24 +35,6 @@
     <description>Object 'A' is never used</description>
   </problem>
 
-  <problem>
-    <file>companionObjectUnused.kt</file>
-    <line>2</line>
-    <module>light_idea_test_case</module>
-    <entry_point TYPE="file" FQNAME="companionObjectUnused.kt" />
-    <problem_class severity="WARNING" attribute_key="NOT_USED_ELEMENT_ATTRIBUTES">Unused Symbol</problem_class>
-    <description>Object 'Companion' is never used</description>
-  </problem>
-
-  <problem>
-    <file>companionObjectUnused.kt</file>
-    <line>7</line>
-    <module>light_idea_test_case</module>
-    <entry_point TYPE="file" FQNAME="companionObjectUnused.kt" />
-    <problem_class severity="WARNING" attribute_key="NOT_USED_ELEMENT_ATTRIBUTES">Unused Symbol</problem_class>
-    <description>Object 'Named' is never used</description>
-  </problem>
-
   <problem>
     <file>usedViaMemberImport.kt</file>
     <line>11</line>