GS-hw: Optimize pabe (per pixel alpha blending)#5135
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Add an early condition to check if alpha is lower than 128, if so then no blending so early exit.
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Description of Changes
Add an early condition to check if alpha is lower than 128, if so then no blending so early exit.
Rationale behind Changes
Optimization, accuracy on hw blending.
Suggested Testing Steps
Test the following games: SOTC, Breath of Fire Dragon Quarter, Strawberry Shortcake, Super Robot Wars, Cartoon Network Racing.