Make bound functions have poisoned .caller and .arguments.

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index 884f28e7ee5d355134c51fc5a7af9755a60df56a..56acc86aa780702c8da66ed7ca6c82cbffb6b998 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -522,7 +522,7 @@ Handle<DescriptorArray> Genesis::ComputeStrictFunctionInstanceDescriptor(
                                     ? 4
                                     : 5);
   PropertyAttributes attributes = static_cast<PropertyAttributes>(
-      DONT_ENUM | DONT_DELETE | READ_ONLY);
+      DONT_ENUM | DONT_DELETE);
 
   {  // length
     Handle<Foreign> foreign = factory()->NewForeign(&Accessors::FunctionLength);
@@ -547,8 +547,8 @@ Handle<DescriptorArray> Genesis::ComputeStrictFunctionInstanceDescriptor(
 
   // prototype
   if (prototypeMode != DONT_ADD_PROTOTYPE) {
-    if (prototypeMode == ADD_WRITEABLE_PROTOTYPE) {
-      attributes = static_cast<PropertyAttributes>(attributes & ~READ_ONLY);
+    if (prototypeMode != ADD_WRITEABLE_PROTOTYPE) {
+      attributes = static_cast<PropertyAttributes>(attributes | READ_ONLY);
     }
     Handle<Foreign> foreign =
         factory()->NewForeign(&Accessors::FunctionPrototype);