Nothing.
FYI though the GPWS manoeuvre is:
1. AP off.
2. Pitch: full up. Full backstick and keep it there.
3. Thrust levers: TOGA.
4. Speed brakes: check retracted.
5. Bank angle: Level (or adjust).
In reality just pulling back the side stick will do the trick. This will disconnect the AP and rapidly raise the AOA, which will give you TOGA thrust, which will automatically stow the speed brakes. Slamming the levers forwards though will give you the thrust marginally sooner and is part of the general Airbus escape manoeuvre of stick slammed back and levers slammed forward. The array of computers and sensors will give you every last ounce of performance available.