Move extensibility check to the top of Object.isFrozen/Object.isSealed

src/v8natives.js

Index: src/v8natives.js
diff --git a/src/v8natives.js b/src/v8natives.js
index 3978e88685156e69ec1660f1ea76d2f8b845b3b9..8563c2e8672f8f71c4f38adf28b3ee2aa2fca703 100644
--- a/src/v8natives.js
+++ b/src/v8natives.js
@@ -1240,16 +1240,16 @@ function ObjectIsSealed(obj) {
   if (%IsJSProxy(obj)) {
     return false;
   }
+  if (%IsExtensible(obj)) {
+    return false;
+  }
   var names = ObjectGetOwnPropertyNames(obj);
   for (var i = 0; i < names.length; i++) {
     var name = names[i];
     var desc = GetOwnProperty(obj, name);
     if (desc.isConfigurable()) return false;
   }
-  if (!ObjectIsExtensible(obj)) {
-    return true;
-  }
-  return false;
+  return true;
 }
 
 
@@ -1261,6 +1261,9 @@ function ObjectIsFrozen(obj) {
   if (%IsJSProxy(obj)) {
     return false;
   }
+  if (%IsExtensible(obj)) {
+    return false;
+  }
   var names = ObjectGetOwnPropertyNames(obj);
   for (var i = 0; i < names.length; i++) {
     var name = names[i];
@@ -1268,10 +1271,7 @@ function ObjectIsFrozen(obj) {
     if (IsDataDescriptor(desc) && desc.isWritable()) return false;
     if (desc.isConfigurable()) return false;
   }
-  if (!ObjectIsExtensible(obj)) {
-    return true;
-  }
-  return false;
+  return true;
 }