improve maitake timer wheel #1337

Job	Run time
changed_paths	7s
rustfmt	22s
cargo check (host)	3m 44s
clippy	2m 53s
Loom tests (cordyceps)	1m 46s
docs	2m 15s
cargo test (host)	4m 54s
cargo test (cross x64)	4m 27s
Loom tests (maitake)	1m 39s
Miri tests (codyceps)	2m 11s
Tests (maitake, no-default-features)	1m 51s
Loom tests (mycelium-util)	1m 9s
build boot image (x86_64)	3m 23s
	30m 41s

Provide feedback