Why? AMD are onto their third generation of heterogeneous systems now which they developed all by themselves. What has IBM ever designed in this space aside from Cell which was a co-development with Sony and Toshiba?
Given that Cell showed up 4-5 years before AMD's apu and was far more exotic in its initial design than fusion, I seriously doubt. AMD is as versed as IBM, Sony and Toshiba contribution included. IBM designs heterogenous system across several different archs with hardware from other vendors and has been doing it for a very long time.
IBM has filed more patents than any other company every year for the last 20 years and with heterogeneous designs being a major component of IBM revenue, I seriously doubt AMD pours as much resources into exploring this particular area as IBM.