[wasm] Add js-api test and fix property details for some functions.

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/base/adapters.h"
 #include "src/base/atomic-utils.h"
 #include "src/code-stubs.h"
 #include "src/compiler/wasm-compiler.h"
@@ skipping 1717 matching lines @@
 
     Handle<JSObject> exports_object = instance;
     if (module_->export_table.size() > 0 && module_->origin == kWasmOrigin) {
       // Create the "exports" object.
       Handle<JSFunction> object_function = Handle<JSFunction>(
           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, READ_ONLY);
+      JSObject::AddProperty(instance, exports_name, exports_object, NONE);
     }
 
     PropertyDescriptor desc;
     desc.set_writable(false);
 
     // Count up export indexes.
     int export_index = 0;
     for (auto exp : module_->export_table) {
       if (exp.kind == kExternalFunction) {
         ++export_index;
@@ skipping 635 matching lines @@
 MaybeHandle<String> WasmCompiledModule::GetFunctionName(
     Handle<WasmCompiledModule> compiled_module, uint32_t func_index) {
   DCHECK_LT(func_index, compiled_module->module()->functions.size());
   WasmFunction& function = compiled_module->module()->functions[func_index];
   Isolate* isolate = compiled_module->GetIsolate();
   MaybeHandle<String> string = ExtractStringFromModuleBytes(
       isolate, compiled_module, function.name_offset, function.name_length);
   if (!string.is_null()) return string.ToHandleChecked();
   return {};
 }