Fix d8's Shell::ReadBuffer after r18227

src/d8.cc

Index: src/d8.cc
diff --git a/src/d8.cc b/src/d8.cc
index 73e438b10d694ff72638a73fdbcf47f22bb74ada..8ac13cf41019c47a53d292c4bee896be39b44d74 100644
--- a/src/d8.cc
+++ b/src/d8.cc
@@ -1133,7 +1133,8 @@ void Shell::ReadBuffer(const v8::FunctionCallbackInfo<v8::Value>& args) {
     Throw(args.GetIsolate(), "Error reading file");
     return;
   }
-  Handle<v8::ArrayBuffer> buffer = ArrayBuffer::New(isolate, data, length);
+  Handle<v8::ArrayBuffer> buffer =
+      ArrayBuffer::New(isolate, data->data, length);
   data->handle.Reset(isolate, buffer);
   data->handle.SetWeak(data, ReadBufferWeakCallback);
   data->handle.MarkIndependent();