rogerl's fix to conform to ECMA by not enumerating regexp instance properties (155291, r=khanson, sr=brendan).

js/src/jsregexp.c

@@ -2374,7 +2374,7 @@ enum regexp_tinyid {
     REGEXP_MULTILINE    = -5
 };
 
-#define REGEXP_PROP_ATTRS (JSPROP_ENUMERATE|JSPROP_PERMANENT|JSPROP_SHARED)
+#define REGEXP_PROP_ATTRS (JSPROP_PERMANENT | JSPROP_SHARED)
 
 static JSPropertySpec regexp_props[] = {
     {"source",     REGEXP_SOURCE,      REGEXP_PROP_ATTRS | JSPROP_READONLY,0,0},