rm more useless generics #3021

Job	Run time
Check no_std	23s
List directories for parallelizing tests	2s
Check (stable)	12s
Check Documentation	51s
Check (nightly)	1m 7s
Check Style	7s
Test (stable)	8m 57s
Test assembly	8m 19s
Test (nightly)	17m 26s
Test (cp6_782/)	6s
Test (mnt4_753/)	10s
Test (mnt6_753/)	9s
Test (./ed_on_mnt4_753)	3m 49s
Test (./secp256r1)	1m 22s
Test (./ed_on_mnt4_298)	1m 5s
Test (./ed_on_cp6_782)	1m 13s
Test (./mnt4_298)	3m 46s
Test (./mnt6_298)	5m 25s
Test (./ed_on_bn254)	55s
Test (./bn254)	2m 41s
Test (./secp256k1)	1m 3s
Test (./bw6_761)	4m 5s
Test (./bls12_377)	4m 3s
Test (./grumpkin)	1m 9s
Test (./secp384r1)	1m 19s
Test (./ed_on_bls12_377)	1m 5s
Test (./secq256k1)	58s
Test (./ed25519)	54s
Test (./ed_on_bls12_381)	1m 11s
Test (./ed_on_bw6_761)	41s
Test (./curve25519)	1m 2s
Test (./ed_on_bls12_381_bandersnatch)	1m 14s
Test (./pallas)	1m 7s
Test (./vesta)	1m 5s
Test (./bw6_767)	4m 9s
Test (./bls12_381)	3m 13s
	1h 26m 23s

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