improve maitake timer wheel #1338

Job	Run time
changed_paths	9s
rustfmt	18s
clippy	3m 14s
build boot image (x86_64)	3m 18s
cargo check (host)	3m 45s
Loom tests (cordyceps)	1m 38s
docs	2m 15s
cargo test (host)	5m 25s
cargo test (cross x64)	4m 45s
Miri tests (codyceps)	2m 22s
Loom tests (maitake)	1m 54s
Tests (maitake, no-default-features)	1m 54s
Loom tests (mycelium-util)	59s
	31m 56s

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