[wasm][asm.js] Make asm.js->wasm return a regular object.

src/wasm/wasm-module.h

 // 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.
 
 #ifndef V8_WASM_MODULE_H_
 #define V8_WASM_MODULE_H_
 
 #include <memory>
 
 #include "src/api.h"
@@ skipping 202 matching lines @@
   WasmModule() : WasmModule(nullptr) {}
   WasmModule(Zone* owned_zone);
   ~WasmModule() {
     if (owned_zone) delete owned_zone;
   }
 
   // Creates a new instantiation of the module in the given isolate.
   static MaybeHandle<WasmInstanceObject> Instantiate(
       Isolate* isolate, ErrorThrower* thrower,
       Handle<WasmModuleObject> wasm_module, Handle<JSReceiver> ffi,
-      Handle<JSArrayBuffer> memory = Handle<JSArrayBuffer>::null());
+      Handle<JSArrayBuffer> memory = Handle<JSArrayBuffer>::null(),
+      Handle<JSObject> export_to = Handle<JSObject>::null());

[titzer, 2017/01/27 09:11:47]

It's not really clear to me why the object to which to export needs to be passed
in from the outside. We already do a origin check inside, so can't we just
create the right kind of exports object in wasm-module.cc and fish out the
"exports" property from the returned module in asm-js.cc?

[bradnelson, 2017/01/28 22:08:13]

Thought about doing it that way, but figured this was a smaller diff.
But probably a better structure.
Done.

 
   MaybeHandle<WasmCompiledModule> CompileFunctions(
       Isolate* isolate, Handle<Managed<WasmModule>> module_wrapper,
       ErrorThrower* thrower, const ModuleWireBytes& wire_bytes,
       Handle<Script> asm_js_script,
       Vector<const byte> asm_js_offset_table_bytes) const;
 };
 
 typedef Managed<WasmModule> WasmModuleWrapper;
 
@@ skipping 236 matching lines @@
 void ValidateModuleState(Isolate* isolate, Handle<WasmModuleObject> module_obj);
 void ValidateOrphanedInstance(Isolate* isolate,
                               Handle<WasmInstanceObject> instance);
 
 }  // namespace testing
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_WASM_MODULE_H_