[ripemd160] Small optimizations for compression #6450

Job	Run time
rust-test-all-features-x86_64	5m 6s
pre-commit-arm64	53s
rust-test-all-features-arm64	4m 47s
pre-commit-x86_64	39s
circuits-snapshot (sha256)	1m 34s
rust-wasm-build-x86_64	1m 3s
circuits-snapshot (keccak)	1m 41s
circuits-snapshot (blake2s)	1m 30s
rust-doc	34s
rust-wasm-build-arm64	55s
circuits-snapshot (hash_based_sig)	1m 34s
rust-checks-arm64	41s
circuits-snapshot (sha512)	1m 34s
rust-test-x86_64	4m 37s
circuits-snapshot (ethsign)	1m 38s
rust-test-arm64	3m 11s
circuits-snapshot (zklogin)	1m 34s
rust-checks-x86_64	45s
	34m 16s

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