JS: refactor generation of functions with optional parameters. Fix #KT-7302, #KT-13888

js/js.translator/testData/box/defaultArguments/superCall.kt

@@ -0,0 +1,28 @@
+package foo
+
+open class A {
+    open fun foo(x: Int = 20, y: Int = 3) = x + y
+}
+
+open class B : A() {
+    override fun foo(x: Int, y: Int) = 0
+
+    fun bar1() = super.foo()
+
+    fun bar2() = super.foo(30)
+
+    fun bar3() = super.foo(y = 4)
+}
+
+fun box(): String {
+    val v1 = B().bar1()
+    if (v1 != 23) return "fail1: $v1"
+
+    val v2 = B().bar2()
+    if (v2 != 33) return "fail2: $v2"
+
+    val v3 = B().bar3()
+    if (v3 != 24) return "fail3: $v3"
+
+    return "OK"
+}