ThreadSetIterator::next comment (#4006) #1017

Job	Run time
benchmark (solana-sdk, cargo +$rust_nightly bench -p solana-sdk --features openssl-vendored)	2m 55s
benchmark (solana-runtime, cargo +$rust_nightly bench -p solana-runtime)	1m 27s
benchmark (solana-gossip, cargo +$rust_nightly bench -p solana-gossip)	3m 35s
benchmark (solana-poh, cargo +$rust_nightly bench -p solana-poh)	1m 30s
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 33s
benchmark (solana-accounts-db, cargo +$rust_nightly bench -p solana-accounts-db --bench accounts_...	13m 50s
	30m 48s

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