KT-6877 Wrong unused function inspection on anonymous object member

#KT-6877 fixed

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

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

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

@@ -0,0 +1 @@
+Function call (10: 21) localObject.f()

idea/testData/inspections/unusedSymbol/function/membersOfAnonymousInClass.kt

@@ -0,0 +1,43 @@
+class Klass {
+    private val localObject = object {
+        fun f() {
+        }
+
+        val p = 5
+    }
+
+    init {
+        localObject.f()
+        localObject.p
+    }
+
+
+    private fun localObject2() = object {
+        fun f() {
+        }
+
+        val p = 5
+    }
+
+    init {
+        localObject2().f()
+        localObject2().p
+    }
+
+
+    private val a = object {
+        val b = object {
+            val c = object {
+                val d = 5
+            }
+        }
+    }
+
+    init {
+        a.b.c.d
+    }
+}
+
+fun main(args: Array<String>) {
+    Klass()
+}