Unused symbol: fix false positive in anonymous object in top level or companion object

#KT-31800 Fixed
#KT-20868 Fixed

idea/testData/findUsages/kotlin/findFunctionUsages/objectExpressionMemberInCompanion.0.kt

@@ -0,0 +1,14 @@
+// PSI_ELEMENT: org.jetbrains.kotlin.psi.KtNamedFunction
+// OPTIONS: usages
+class Foo {
+    companion object {
+        private val localObject = object : Any() {
+            fun <caret>f() {
+            }
+        }
+    }
+
+    fun bar() {
+        localObject.f()
+    }
+}

idea/testData/findUsages/kotlin/findFunctionUsages/objectExpressionMemberInCompanion.results.txt

@@ -0,0 +1 @@
+Function call 12 localObject.f()

idea/testData/findUsages/kotlin/findFunctionUsages/objectExpressionMemberInTopLevel.0.kt

@@ -0,0 +1,12 @@
+// PSI_ELEMENT: org.jetbrains.kotlin.psi.KtNamedFunction
+// OPTIONS: usages
+private val localObject = object : Any() {
+    fun <caret>f() {
+    }
+}
+
+class Foo {
+    fun bar() {
+        localObject.f()
+    }
+}

idea/testData/findUsages/kotlin/findFunctionUsages/objectExpressionMemberInTopLevel.results.txt

@@ -0,0 +1 @@
+Function call 10 localObject.f()