KT-2106 Mixed named and positional arguments should be allowed

#KT-2106 Fixed

compiler/testData/codegen/box/defaultArguments/function/mixingNamedAndPositioned.kt

@@ -0,0 +1,16 @@
+fun foo(a: String = "Default", b: Int = 1, c: Long = 2): String {
+  return "$a $b $c"
+}
+
+fun box(): String {
+  val test1 = foo("test1", 2, c = 3)
+  if (test1 != "test1 2 3") return test1
+
+  val test2 = foo("test2", c = 3)
+  if (test2 != "test2 1 3") return test2
+
+  val test3 = foo("test3", b = 3)
+  if (test3 != "test3 3 2") return test3
+
+  return "OK"
+}