improve maitake timer wheel #1330

Job	Run time
changed_paths	6s
cargo check (host)	2m 14s
Loom tests (cordyceps)	1m 43s
rustfmt	19s
clippy	2m 19s
docs	2m 4s
cargo test (host)	5m 20s
cargo test (cross x64)	1m 41s
build boot image (x86_64)	1m 29s
Miri tests (codyceps)	2m 17s
Loom tests (maitake)	1m 51s
Tests (maitake, no-default-features)	1m 57s
Loom tests (mycelium-util)	1m 1s
	24m 21s

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