[Native] Fix tailrec test.

tailrec is no longer allowed on open functions but this test is
still using it.

kotlin-native/backend.native/tests/build.gradle

@@ -3165,8 +3165,7 @@ tasks.register("vararg_of_literals", KonanLocalTest) {
 }
 
 standaloneTest('tailrec') {
-    disabled = isAggressiveGC || // TODO: Investigate why too slow
-            isK2(project) // KT-56269
+    disabled = isAggressiveGC // TODO: Investigate why too slow
     useGoldenData = true
     source = "lower/tailrec.kt"
     flags = ['-XXLanguage:-ProhibitTailrecOnVirtualMember', '-e', 'lower.tailrec.main']

kotlin-native/backend.native/tests/lower/tailrec.kt

@@ -18,12 +18,6 @@ fun main() {
 
     println(listOf(1, 2, 3).indexOf(3))
     println(listOf(1, 2, 3).indexOf(4))
-
-    println(Integer(5).isLessOrEqualThan(7))
-    println(Integer(42).isLessOrEqualThan(1))
-
-    println(DefaultArgGetter().foo("non-default"))
-    println(EitherDelegatedOrNot(NotDelegated()).get42())
 }
 
 tailrec fun add(x: Int, y: Int): Int = if (x > 0) add(x - 1, y + 1) else y
@@ -61,37 +55,3 @@ tailrec fun <T> List<T>.indexOf(x: T, startIndex: Int = 0): Int {
     return startIndex
 
 }
-
-open class Integer(val value: Int) {
-    open tailrec fun isLessOrEqualThan(value: Int): Boolean {
-        if (this.value == value) {
-            return true
-        } else if (value > 0) {
-            return this.isLessOrEqualThan(value - 1)
-        } else {
-            return false
-        }
-    }
-}
-
-open class DefaultArgHolder {
-    open fun foo(s: String = "default") = s
-}
-
-class DefaultArgGetter : DefaultArgHolder() {
-    override tailrec fun foo(s: String): String {
-        return if (s == "default") s else foo()
-    }
-}
-
-open class EitherDelegatedOrNot(val delegate: EitherDelegatedOrNot?) {
-    open tailrec fun get42(): Int = if (delegate != null) {
-        delegate.get42()
-    } else {
-        throw Error()
-    }
-}
-
-class NotDelegated : EitherDelegatedOrNot(null) {
-    override fun get42() = 42
-}

kotlin-native/backend.native/tests/lower/tailrec.out

@@ -8,7 +8,3 @@
 ready!
 2
 -1
-true
-false
-default
-42