asSequence returns empty sequence singleton for empty arrays and strings.

#KT-8450 Fixed

libraries/tools/kotlin-stdlib-gen/src/templates/Sequence.kt

@@ -26,7 +26,6 @@ fun sequences(): List<GenericFunction> {
     }
     templates add f("asSequence()") {
         include(Maps)
-        exclude(Sequences)
         doc { "Returns a sequence from the given collection." }
         returns("Sequence<T>")
         body {
@@ -39,6 +38,17 @@ fun sequences(): List<GenericFunction> {
             """
         }
 
+        body(ArraysOfObjects, ArraysOfPrimitives, Strings) {
+            """
+            if (isEmpty()) return emptySequence()
+            return object : Sequence<T> {
+                override fun iterator(): Iterator<T> {
+                    return this@asSequence.iterator()
+                }
+            }
+            """
+        }
+
         body(Sequences) {
             """
             return this