Turn on wasm flags all the time, add a reference from wasm functions to the module.

src/factory.cc

 // Copyright 2014 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 "src/factory.h"
 
 #include "src/allocation-site-scopes.h"
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
 #include "src/conversions.h"
@@ skipping 1196 matching lines @@
   Handle<Context> context(isolate()->native_context());
   Handle<SharedFunctionInfo> info =
       NewSharedFunctionInfo(name, code, map->is_constructor());
   DCHECK(is_sloppy(info->language_mode()));
   DCHECK(
       map.is_identical_to(isolate()->sloppy_function_map()) ||
       map.is_identical_to(isolate()->sloppy_function_without_prototype_map()) ||
       map.is_identical_to(
           isolate()->sloppy_function_with_readonly_prototype_map()) ||
       map.is_identical_to(isolate()->strict_function_map()) ||
+      (FLAG_expose_wasm &&
+       map.is_identical_to(isolate()->wasm_function_map())) ||
       map.is_identical_to(isolate()->proxy_function_map()));
   return NewFunction(map, info, context);
 }
 
 
 Handle<JSFunction> Factory::NewFunction(Handle<String> name) {
   return NewFunction(
       isolate()->sloppy_function_map(), name, MaybeHandle<Code>());
 }
 
@@ skipping 1093 matching lines @@
 }
 
 
 Handle<Object> Factory::ToBoolean(bool value) {
   return value ? true_value() : false_value();
 }
 
 
 }  // namespace internal
 }  // namespace v8