ancient packing iterates serially instead of parallel (#2748) #219

Job	Run time
benchmark (solana-sdk, cargo +$rust_nightly bench -p solana-sdk)	1m 30s
benchmark (solana-runtime, cargo +$rust_nightly bench -p solana-runtime)	1m 13s
benchmark (solana-gossip, cargo +$rust_nightly bench -p solana-gossip)	3m 4s
benchmark (solana-poh, cargo +$rust_nightly bench -p solana-poh)	1m 34s
benchmark (solana-core, cargo +$rust_nightly bench -p solana-core)	5m 58s
benchmark (sbf, make -C programs/sbf all, cargo +$rust_nightly bench --manifest-path programs/sbf...	1m 37s
benchmark (solana-accounts-db, cargo +$rust_nightly bench -p solana-accounts-db --bench accounts_...	13m 28s
	28m 24s

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