Introduce 'fail' method to throw AssertionError with cause

#KT-37804

libraries/stdlib/js-ir/src/kotlin/exceptions.kt

@@ -80,6 +80,8 @@ public actual open class AssertionError : Error {
     public actual constructor() : super()
     public constructor(message: String?) : super(message)
     public actual constructor(message: Any?) : super(message?.toString(), message as? Throwable)
+    @SinceKotlin("1.4")
+    public constructor(message: String?, cause: Throwable?) : super(message, cause)
 }
 
 public actual open class NoSuchElementException : RuntimeException {

libraries/stdlib/js-v1/src/kotlin/exceptions.kt

@@ -80,7 +80,9 @@ public actual open class ClassCastException actual constructor(message: String?)
     actual constructor() : this(null)
 }
 
-public actual open class AssertionError private constructor(message: String?, cause: Throwable?) : Error(message, cause) {
+public actual open class AssertionError
+@SinceKotlin("1.4")
+constructor(message: String?, cause: Throwable?) : Error(message, cause) {
     actual constructor() : this(null)
     constructor(message: String?) : this(message, null)
     actual constructor(message: Any?) : this(message.toString(), message as? Throwable)