Use "Faster Subgroup Checks for BLS12-381" for is_torsion_free
#80
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This uses @ebfull's method for faster subgroup checks
I didn't know if maybe there's a specific reason you all aren't already using these methods here. If so, sorry for the noise!
On my Core i7 Macbook Pro, the "G1Affine subgroup check" benchmark takes:
main
Similarly, the "G2Affine subgroup check" benchmark takes:
main