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

src/messages.js

Index: src/messages.js
diff --git a/src/messages.js b/src/messages.js
index 859bc0d721cd84bd9ba5bdd86b011b06d59dff8b..3446402ff9506037dc496589a6115aa46816806a 100644
--- a/src/messages.js
+++ b/src/messages.js
@@ -282,8 +282,8 @@ function MakeGenericError(constructor, type, args) {
  * Set up the Script function and constructor.
  */
 %FunctionSetInstanceClassName(Script, 'Script');
-%SetProperty(Script.prototype, 'constructor', Script,
-             DONT_ENUM | DONT_DELETE | READ_ONLY);
+%DefineProperty(Script.prototype, 'constructor', Script,
+                DONT_ENUM | DONT_DELETE | READ_ONLY);
 %SetCode(Script, function(x) {
   // Script objects can only be created by the VM.
   throw new $Error("Not supported");
@@ -1181,8 +1181,9 @@ function SetUpError() {
     // effects when overwriting the error functions from
     // user code.
     var name = f.name;
-    %SetProperty(global, name, f, DONT_ENUM);
-    %SetProperty(builtins, '$' + name, f, DONT_ENUM | DONT_DELETE | READ_ONLY);
+    %DefineProperty(global, name, f, DONT_ENUM);
+    %DefineProperty(builtins, '$' + name, f,
+                    DONT_ENUM | DONT_DELETE | READ_ONLY);
     // Configure the error function.
     if (name == 'Error') {
       // The prototype of the Error object must itself be an error.
@@ -1197,8 +1198,8 @@ function SetUpError() {
       %FunctionSetPrototype(f, new $Error());
     }
     %FunctionSetInstanceClassName(f, 'Error');
-    %SetProperty(f.prototype, 'constructor', f, DONT_ENUM);
-    %SetProperty(f.prototype, "name", name, DONT_ENUM);
+    %DefineProperty(f.prototype, 'constructor', f, DONT_ENUM);
+    %DefineProperty(f.prototype, "name", name, DONT_ENUM);
     %SetCode(f, function(m) {
       if (%_IsConstructCall()) {
         // Define all the expected properties directly on the error
@@ -1230,7 +1231,7 @@ SetUpError();
 
 $Error.captureStackTrace = captureStackTrace;
 
-%SetProperty($Error.prototype, 'message', '', DONT_ENUM);
+%DefineProperty($Error.prototype, 'message', '', DONT_ENUM);
 
 // Global list of error objects visited during ErrorToString. This is
 // used to detect cycles in error toString formatting.