Update tests

compiler/testData/codegen/box/specialBuiltins/throwableComplex.kt

@@ -0,0 +1,42 @@
+open class Base(message: String? = null, cause: Throwable? = null) : Throwable(message, cause)
+
+open class Base2(message: String? = null, cause: Throwable? = null): Base(message, cause)
+
+open class Override(message: String? = null, cause: Throwable? = null) : Base2(message, cause) {
+
+    var i = 0
+
+    override val message: String?
+        get() = "Override: " + super.message + "${i++}"
+}
+
+open class OverBase(message: String? = null, cause: Throwable? = null): Override(message, cause)
+
+open class OverOverride(message: String? = null, cause: Throwable? = null) : OverBase(message, cause) {
+
+    override val message: String?
+        get() = "OverOver: " + super.message + "${i++}"
+
+    override val cause: Throwable?
+        get() = super.cause ?: this
+
+}
+
+
+fun box(): String {
+    check(Base("O", Base("K")), "OK")
+    check(Override("OK"), "Override: OK0")
+    check(OverOverride("OK"), "OverOver: Override: OK01OverOver: Override: OK23")
+    return "OK"
+}
+
+
+fun check(t: Throwable, msg: String) {
+    try {
+        throw t
+    } catch (e: Throwable) {
+        val c = t.cause
+        val m = if (c != null) t.message!! + c.message!! else t.message!!
+        if (m != msg) throw AssertionError(m)
+    }
+}