Create a internal, global native context used only for generated code stubs

src/snapshot/natives-external.cc

Index: src/snapshot/natives-external.cc
diff --git a/src/snapshot/natives-external.cc b/src/snapshot/natives-external.cc
index 3649c2a69ff9e33b42cd36133d55bf80c9195d0a..94fc2c11ff8c4aa950d9b14f767ed527732405a8 100644
--- a/src/snapshot/natives-external.cc
+++ b/src/snapshot/natives-external.cc
@@ -157,6 +157,7 @@ void ReadNatives() {
   if (natives_blob_ && NativesHolder<CORE>::empty()) {
     SnapshotByteSource bytes(natives_blob_->data, natives_blob_->raw_size);
     NativesHolder<CORE>::set(NativesStore::MakeFromScriptsSource(&bytes));
+    NativesHolder<CODE_STUB>::set(NativesStore::MakeFromScriptsSource(&bytes));
     NativesHolder<EXPERIMENTAL>::set(
         NativesStore::MakeFromScriptsSource(&bytes));
     NativesHolder<EXTRAS>::set(NativesStore::MakeFromScriptsSource(&bytes));
@@ -185,6 +186,7 @@ void SetNativesFromFile(StartupData* natives_blob) {
  */
 void DisposeNatives() {
   NativesHolder<CORE>::Dispose();
+  NativesHolder<CODE_STUB>::Dispose();
   NativesHolder<EXPERIMENTAL>::Dispose();
   NativesHolder<EXTRAS>::Dispose();
 }
@@ -230,6 +232,7 @@ Vector<const char> NativesCollection<type>::GetScriptsSource() {
 // The compiler can't 'see' all uses of the static methods and hence
 // my choice to elide them. This we'll explicitly instantiate these.
 template class NativesCollection<CORE>;
+template class NativesCollection<CODE_STUB>;
 template class NativesCollection<EXPERIMENTAL>;
 template class NativesCollection<EXTRAS>;
 }  // namespace internal