compiler: v -autofree can now compile itself

vlib/builtin/js/array.v

@@ -98,11 +98,17 @@ pub fn (a array) reverse() array {
 	return a
 }
 
+// array.clone_static returns an independent copy of a given array
+// It should be used only in -autofree generated code.
+fn (a array) clone_static() array {
+       return a.clone()
+}
+
 pub fn (a array) clone() array {
 	return a
 }
 
-pub fn (a array) free() {
+pub fn (a &array) free() {
 }
 
 // "[ 'a', 'b', 'c' ]"

vlib/builtin/js/string.v

@@ -26,6 +26,11 @@ pub fn tos(s byteptr) string {
 	}	
 }	
 
+// string.clone_static returns an independent copy of a given array
+// It should be used only in -autofree generated code.
+fn (a string) clone_static() string {
+	return a.clone()
+}
 
 pub fn (a string) clone() string {
 	return a
@@ -241,18 +246,9 @@ pub fn (c byte) is_letter() bool {
 	return (c >= `a` && c <= `z`) || (c >= `A` && c <= `Z`)
 }
 
-pub fn (s string) free() {
+pub fn (s &string) free() {
 }
 
-/*
-fn (arr []string) free() {
-	for s in arr {
-		s.free()
-	}
-	C.free(arr.data)
-}
-*/
-
 // all_before('23:34:45.234', '.') == '23:34:45'
 pub fn (s string) all_before(dot string) string {
 	pos := s.index(dot)