[K/N] Fix handling of legacy suspend-function superclass

^KT-50737

kotlin-native/backend.native/tests/codegen/coroutines/inheritance.kt

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package codegen.coroutines.inheritance
+
+import kotlin.test.*
+
+import kotlin.coroutines.*
+import kotlin.coroutines.intrinsics.*
+
+open class EmptyContinuation(override val context: CoroutineContext = EmptyCoroutineContext) : Continuation<Any?> {
+    companion object : EmptyContinuation()
+    override fun resumeWith(result: Result<Any?>) { result.getOrThrow() }
+}
+
+class SuspendHere(): suspend () -> Int {
+    override suspend fun invoke() : Int = suspendCoroutineUninterceptedOrReturn { x ->
+        x.resume(42)
+        COROUTINE_SUSPENDED
+    }
+}
+
+// in old compiler versions all suspend functions were implementing this interface
+// now they are not, but let's test it works correctly
+class SuspendHereLegacy(): suspend () -> Int, SuspendFunction<Int> {
+    override suspend fun invoke() : Int = suspendCoroutineUninterceptedOrReturn { x ->
+        x.resume(43)
+        COROUTINE_SUSPENDED
+    }
+}
+
+fun builder(c: suspend () -> Unit) {
+    c.startCoroutine(EmptyContinuation)
+}
+
+@Test fun runTest() {
+    var result = 0
+
+    builder {
+        result = SuspendHere()()
+    }
+    println(result)
+    builder {
+        result = SuspendHereLegacy()()
+    }
+    println(result)
+}

kotlin-native/backend.native/tests/codegen/coroutines/inheritance.out

@@ -0,0 +1,2 @@
+42
+43