[modules] Do basic linking.

src/ast/modules.cc

Index: src/ast/modules.cc
diff --git a/src/ast/modules.cc b/src/ast/modules.cc
index e48bdac3a5120f745eca263c2f6a46d8f1954851..6a0f26a89580752df51f2d4aaefe2fea8cda40a1 100644
--- a/src/ast/modules.cc
+++ b/src/ast/modules.cc
@@ -190,7 +190,7 @@ void ModuleDescriptor::MakeIndirectExportsExplicit(Zone* zone) {
       entry->import_name = import->second->import_name;
       entry->module_request = import->second->module_request;
       entry->local_name = nullptr;
-      special_exports_.Add(entry, zone);
+      AddSpecialExport(entry, zone);
       it = regular_exports_.erase(it);
     } else {
       it++;