JVM IR: Use INVOKESPECIAL instead of INVOKEVIRTUAL for default private

suspend functions.

 #KT-26592

compiler/testData/codegen/box/coroutines/featureIntersection/jvmDefault.kt

@@ -0,0 +1,34 @@
+// WITH_RUNTIME
+// !JVM_DEFAULT_MODE: all
+// TARGET_BACKEND: JVM
+// JVM_TARGET: 1.8
+// IGNORE_BACKEND: JVM
+
+import kotlin.coroutines.*
+
+interface Foo {
+    private suspend fun test(): String {
+        return "OK"
+    }
+
+    suspend fun foo(): String {
+        return test()
+    }
+}
+
+fun builder(c: suspend () -> Unit) {
+    c.startCoroutine(Continuation(EmptyCoroutineContext) {
+        it.getOrThrow()
+    })
+}
+
+fun box(): String {
+    var res = "FAIL"
+
+    builder {
+        val foo: Foo = object : Foo{}
+        res = foo.foo()
+    }
+
+    return res
+}