Deprecated `divn` and implemented `core::ops::Shr` #2565

Job	Run time
Check (stable)	8s
Check Documentation	55s
Check (nightly)	1m 11s
Test (stable)	5m 46s
List directories for parallelizing tests	2s
Check Style	5s
Test (nightly)	10m 57s
Check no_std	37s
Test assembly	5m 24s
Test (mnt4_753/)	18s
Test (cp6_782/)	7s
Test (mnt6_753/)	20m 51s
Test (./bw6_761)	2m 42s
Test (./ed_on_mnt4_298)	54s
Test (./ed_on_mnt4_753)	1m 34s
Test (./pallas)	1m 1s
Test (./bn254)	2m 6s
Test (./ed_on_cp6_782)	59s
Test (./ed25519)	53s
Test (./secq256k1)	48s
Test (./ed_on_bls12_381)	1m 8s
Test (./secp256k1)	1m 4s
Test (./grumpkin)	1m 7s
Test (./bls12_377)	3m 24s
Test (./ed_on_bw6_761)	38s
Test (./curve25519)	58s
Test (./mnt4_298)	2m 3s
Test (./bls12_381)	2m 59s
Test (./secp384r1)	1m 0s
Test (./mnt6_298)	2m 56s
Test (./bw6_767)	2m 56s
Test (./secp256r1)	48s
Test (./ed_on_bls12_377)	1m 4s
Test (./ed_on_bls12_381_bandersnatch)	54s
Test (./ed_on_bn254)	51s
Test (./vesta)	59s
	1h 22m 7s

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