Directly create API functions with readonly prototypes rather than converting. Remove FunctionSetRe…

src/apinatives.js

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file contains infrastructure used by the API.  See
 // v8natives.js for an explanation of these files are processed and
 // loaded.
 
 
 function CreateDate(time) {
@@ skipping 31 matching lines @@
 function InstantiateFunction(data, name) {
   // We need a reference to kApiFunctionCache in the stack frame
   // if we need to bail out from a stack overflow.
   var cache = kApiFunctionCache;
   var serialNumber = %GetTemplateField(data, kApiSerialNumberOffset);
   var isFunctionCached =
    (serialNumber in cache) && (cache[serialNumber] != kUninitialized);
   if (!isFunctionCached) {
     try {
       var flags = %GetTemplateField(data, kApiFlagOffset);
-      var has_proto = !(flags & (1 << kRemovePrototypeBit));
       var prototype;
-      if (has_proto) {
+      if (!(flags & (1 << kRemovePrototypeBit))) {
         var template = %GetTemplateField(data, kApiPrototypeTemplateOffset);
         prototype = typeof template === 'undefined'
             ?  {} : Instantiate(template);
 
         var parent = %GetTemplateField(data, kApiParentTemplateOffset);
         // Note: Do not directly use a function template as a condition, our
         // internal ToBoolean doesn't handle that!
         if (typeof parent !== 'undefined') {
           var parent_fun = Instantiate(parent);
           %SetPrototype(prototype, parent_fun.prototype);
         }
       }
       var fun = %CreateApiFunction(data, prototype);
       if (name) %FunctionSetName(fun, name);
       var doNotCache = flags & (1 << kDoNotCacheBit);
       if (!doNotCache) cache[serialNumber] = fun;
-      if (has_proto && flags & (1 << kReadOnlyPrototypeBit)) {
-        %FunctionSetReadOnlyPrototype(fun);
-      }
       ConfigureTemplateInstance(fun, data);
       if (doNotCache) return fun;
     } catch (e) {
       cache[serialNumber] = kUninitialized;
       throw e;
     }
   }
   return cache[serialNumber];
 }
 
@@ skipping 22 matching lines @@
             obj, name, getter, setter, attribute, access_control);
       } else {
         throw "Bad properties array";
       }
       i += length + 1;
     }
   } finally {
     if (requires_access_checks) %EnableAccessChecks(obj);
   }
 }