improve maitake timer wheel #1340

Job	Run time
changed_paths	6s
cargo check (host)	3m 42s
clippy	2m 47s
docs	4m 16s
Loom tests (cordyceps)	1m 38s
rustfmt	14s
cargo test (host)	4m 37s
cargo test (cross x64)	4m 8s
Miri tests (codyceps)	1m 58s
Loom tests (maitake)	4m 18s
Tests (maitake, no-default-features)	1m 34s
Loom tests (mycelium-util)	55s
build boot image (x86_64)	3m 1s
	33m 14s

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