Make a strict function's "name" property non-writable.

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index 4d69f8407f4fb4e9bff20bd174b8cb848d824fe6..50beafa8e05ed0b3b7528d7bc524e52bc9aa5349 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -407,6 +407,8 @@ void Genesis::SetFunctionInstanceDescriptor(
   }
   PropertyAttributes attribs = static_cast<PropertyAttributes>(
       DONT_ENUM | DONT_DELETE | READ_ONLY);
+  PropertyAttributes ro_configurable_attribs =
+      static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY);
   map->set_instance_descriptors(*descriptors);
 
   {  // Add length.
@@ -414,7 +416,8 @@ void Genesis::SetFunctionInstanceDescriptor(
     map->AppendDescriptor(&d, witness);
   }
   {  // Add name.
-    CallbacksDescriptor d(*factory()->name_string(), *name, attribs);
+    CallbacksDescriptor d(*factory()->name_string(), *name,
+                          ro_configurable_attribs);
     map->AppendDescriptor(&d, witness);
   }
   {  // Add arguments.
@@ -547,6 +550,8 @@ void Genesis::SetStrictFunctionInstanceDescriptor(
       static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE);
   PropertyAttributes ro_attribs =
       static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY);
+  PropertyAttributes ro_configurable_attribs =
+      static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY);
   map->set_instance_descriptors(*descriptors);
 
   {  // Add length.
@@ -554,7 +559,8 @@ void Genesis::SetStrictFunctionInstanceDescriptor(
     map->AppendDescriptor(&d, witness);
   }
   {  // Add name.
-    CallbacksDescriptor d(*factory()->name_string(), *name, rw_attribs);
+    CallbacksDescriptor d(*factory()->name_string(), *name,
+                          ro_configurable_attribs);
     map->AppendDescriptor(&d, witness);
   }
   {  // Add arguments.