First of all, I don't know what is your goal and what do you want to achieve but:
1. Those IR receivers have an open-collector output so electrically it is possible to connect them parallel, in a very similar way like devices on the i2c bus are connected.
2. Other solutions depend on the software you use to manage the receiver. Most of them base on the external interrupts. While m8 offers two external interrupts it wouldn't be a big deal to handle two receivers simultaneusly.
The most suitable solution depends on the purpose (i.e. to decode signal from two different remote controllers, in two different standarts etc.)
So as I suggested try to connect them parallel. It shall works. If you use your device inside a building, it shouldn't be even neccessary. Those receviers are sensitive enough to catch a signal reflected on the walls, when a remote controller is oriented in different direction than in front of the receiver.