[wasm] Fix bounds check in LoadDataSegments.

test/common/wasm/wasm-module-runner.cc

 // Copyright 2016 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 "test/common/wasm/wasm-module-runner.h"
 
 #include "src/handles.h"
 #include "src/isolate.h"
 #include "src/objects.h"
 #include "src/property-descriptor.h"
@@ skipping 36 matching lines @@
 }
 
 const Handle<JSObject> InstantiateModuleForTesting(Isolate* isolate,
                                                    ErrorThrower* thrower,
                                                    const WasmModule* module) {
   CHECK(module != nullptr);
 
   if (module->import_table.size() > 0) {
     thrower->CompileError("Not supported: module has imports.");
   }
-  if (module->export_table.size() == 0) {
-    thrower->CompileError("Not supported: module has no exports.");
-  }
+
   if (thrower->error()) return Handle<JSObject>::null();
 
   // Although we decoded the module for some pre-validation, run the bytes
   // again through the normal pipeline.
   // TODO(wasm): Use {module} instead of decoding the module bytes again.
   MaybeHandle<JSObject> module_object = CreateModuleObjectFromBytes(
       isolate, module->module_start, module->module_end, thrower,
       ModuleOrigin::kWasmOrigin, Handle<Script>::null(), nullptr, nullptr);
   if (module_object.is_null()) {
     thrower->CompileError("Module pre-validation failed.");
@@ skipping 153 matching lines @@
 
 void SetupIsolateForWasmModule(Isolate* isolate) {
   WasmJs::InstallWasmMapsIfNeeded(isolate, isolate->native_context());
   WasmJs::InstallWasmModuleSymbolIfNeeded(isolate, isolate->global_object(),
                                           isolate->native_context());
 }
 }  // namespace testing
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8