Deprecated `divn` and implemented `core::ops::Shr` #2564

Job	Run time
Check Style	4s
Check (stable)	6s
Check (nightly)	31s
List directories for parallelizing tests	5s
Check Documentation	58s
Test (stable)	35s
Test (mnt4_753/)	22s
Test (nightly)	36s
Test (mnt6_753/)	23m 54s
Check no_std	31s
Test assembly	5m 24s
Test (cp6_782/)	4s
Test (./bw6_761)	2m 43s
Test (./ed_on_mnt4_298)	57s
Test (./ed_on_mnt4_753)	1m 38s
Test (./pallas)	58s
Test (./bn254)	1m 58s
Test (./ed_on_cp6_782)	59s
Test (./ed25519)	50s
Test (./secq256k1)	49s
Test (./ed_on_bls12_381)	1m 3s
Test (./secp256k1)	1m 2s
Test (./grumpkin)	1m 1s
Test (./bls12_377)	3m 25s
Test (./ed_on_bw6_761)	49s
Test (./curve25519)	1m 1s
Test (./mnt4_298)	2m 9s
Test (./bls12_381)	2m 55s
Test (./secp384r1)	51s
Test (./mnt6_298)	2m 52s
Test (./bw6_767)	2m 54s
Test (./secp256r1)	52s
Test (./ed_on_bls12_377)	1m 4s
Test (./ed_on_bls12_381_bandersnatch)	1m 4s
Test (./ed_on_bn254)	51s
Test (./vesta)	1m 7s
	1h 9m 2s

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