Fix for KT-5910: Can't call Throwable() in Kotlin

#KT-5910 Fixed

core/builtins/native/kotlin/Throwable.kt

@@ -22,7 +22,13 @@ package kotlin
  * @param message the detail message string.
  * @param cause the cause of this throwable.
  */
-public open class Throwable(val message: String? = null, val cause: Throwable? = null) {
+public open class Throwable(val message: String?, val cause: Throwable?) {
+
+    constructor(message: String?) : this(message, null)
+
+    constructor(cause: Throwable?) : this(cause?.toString(), cause)
+
+    constructor() : this(null, null)
     /**
      * Prints the stack trace of this throwable to the standard output.
      */