improve maitake timer wheel #1339

Job	Run time
changed_paths	9s
cargo check (host)	3m 44s
docs	2m 3s
clippy	2m 53s
build boot image (x86_64)	3m 21s
rustfmt	25s
cargo test (host)	3m 46s
cargo test (cross x64)	4m 24s
Loom tests (cordyceps)	1m 40s
Miri tests (codyceps)	2m 13s
Loom tests (maitake)	1m 42s
Tests (maitake, no-default-features)	1m 47s
Loom tests (mycelium-util)	1m 1s
	29m 8s

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