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

#KT-31800 Fixed
#KT-20868 Fixed

idea/testData/inspectionsLocal/unusedSymbol/inAnonymousDeeplyInTopLevel.kt

@@ -0,0 +1,16 @@
+// PROBLEM: none
+// WITH_RUNTIME
+
+private val xs = listOf(1, 2, 3).flatMap { x ->
+    listOf(3, 4, 5).map { y ->
+        object {
+            val <caret>value = x + y
+        }
+    }
+}
+
+fun foo() {
+    xs.forEach {
+        println("value: " + it.value)
+    }
+}

idea/testData/inspectionsLocal/unusedSymbol/inAnonymousInCompanion.kt

@@ -0,0 +1,13 @@
+// PROBLEM: none
+class Some {
+    fun bar() {
+        writer().sayHello()
+    }
+
+    companion object {
+        private fun writer() = object {
+            fun <caret>sayHello() {
+            }
+        }
+    }
+}

idea/testData/inspectionsLocal/unusedSymbol/inAnonymousInTopLovel.kt

@@ -0,0 +1,9 @@
+// PROBLEM: none
+fun main() {
+    writer.sayHello()
+}
+
+private val writer = object {
+    fun <caret>sayHello() {
+    }
+}