FIR2IR: better filter out non-declared data class properties

compiler/testData/codegen/box/delegation/inDataClass.kt

@@ -0,0 +1,13 @@
+interface A {
+    fun foo(): String
+    val bar: String
+}
+
+class B : A {
+    override fun foo(): String = "O"
+    override val bar: String get() = "K"
+}
+
+data class C(val a: A): A by a
+
+fun box() = C(B()).let { it.foo() + it.bar }