Split SetProperty(...attributes, strictmode) into AddProperty(...attributes) and SetProperty(...…

src/collection.js

Index: src/collection.js
diff --git a/src/collection.js b/src/collection.js
index a1342a373322b79e85a811fd72aee463161bd99c..4bdcad57e0589feba062de5093e07983722db32c 100644
--- a/src/collection.js
+++ b/src/collection.js
@@ -96,7 +96,7 @@ function SetUpSet() {
 
   %SetCode($Set, SetConstructor);
   %FunctionSetPrototype($Set, new $Object());
-  %SetProperty($Set.prototype, "constructor", $Set, DONT_ENUM);
+  %DefineProperty($Set.prototype, "constructor", $Set, DONT_ENUM);
 
   %FunctionSetLength(SetForEach, 1);
 
@@ -207,7 +207,7 @@ function SetUpMap() {
 
   %SetCode($Map, MapConstructor);
   %FunctionSetPrototype($Map, new $Object());
-  %SetProperty($Map.prototype, "constructor", $Map, DONT_ENUM);
+  %DefineProperty($Map.prototype, "constructor", $Map, DONT_ENUM);
 
   %FunctionSetLength(MapForEach, 1);