add uncached Function::New

src/apinatives.js

Index: src/apinatives.js
diff --git a/src/apinatives.js b/src/apinatives.js
index 7adeb7e7aeb379b14a55fc1c4fb1eaab93c76995..5fb36c09e7242b6289bb9d5f35551893b6e85ed8 100644
--- a/src/apinatives.js
+++ b/src/apinatives.js
@@ -74,8 +74,9 @@ function InstantiateFunction(data, name) {
       cache[serialNumber] = null;
       var fun = %CreateApiFunction(data);
       if (name) %FunctionSetName(fun, name);
-      cache[serialNumber] = fun;
       var flags = %GetTemplateField(data, kApiFlagOffset);
+      var doNotCache = flags & (1 << kDoNotCacheBit);
+      if (!doNotCache) cache[serialNumber] = fun;
       if (flags & (1 << kRemovePrototypeBit)) {
         %FunctionRemovePrototype(fun);
       } else {
@@ -97,6 +98,7 @@ function InstantiateFunction(data, name) {
         }
       }
       ConfigureTemplateInstance(fun, data);
+      if (doNotCache) return fun;
     } catch (e) {
       cache[serialNumber] = kUninitialized;
       throw e;