FIR2IR: Fix inheritance case from built-in interface with default methods

compiler/testData/codegen/box/jvm8/defaults/builtInsInherited.kt

@@ -0,0 +1,16 @@
+// TARGET_BACKEND: JVM
+// JVM_TARGET: 1.8
+// FULL_JDK
+// WITH_RUNTIME
+import java.util.function.Consumer
+
+class A : Iterable<String> {
+    override fun iterator(): Iterator<String> = listOf("OK").iterator()
+}
+
+fun box(): String {
+    var res = ""
+    A().forEach(Consumer { res += it })
+
+    return res
+}