[wasm] Instance exports object should be iterable

src/wasm/wasm-module.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <memory>
 
 #include "src/assembler-inl.h"
 #include "src/base/adapters.h"
 #include "src/base/atomic-utils.h"
 #include "src/code-stubs.h"
@@ skipping 1866 matching lines @@
           isolate_->native_context()->object_function(), isolate_);
       exports_object =
           isolate_->factory()->NewJSObject(object_function, TENURED);
       Handle<String> exports_name =
           isolate_->factory()->InternalizeUtf8String("exports");
       JSObject::AddProperty(instance, exports_name, exports_object, NONE);
     }
 
     PropertyDescriptor desc;
     desc.set_writable(false);
+    desc.set_enumerable(true);
 
     // Count up export indexes.
     int export_index = 0;
     for (auto exp : module_->export_table) {
       if (exp.kind == kExternalFunction) {
         ++export_index;
       }
     }
 
     // Store weak references to all exported functions.
@@ skipping 744 matching lines @@
 
     JSObject::AddProperty(entry, name_string, export_name.ToHandleChecked(),
                           NONE);
     JSObject::AddProperty(entry, kind_string, export_kind, NONE);
 
     storage->set(index, *entry);
   }
 
   return array_object;
 }