feat(hal-x86_64): more local APIC embetterments #1431

Job	Run time
changed_paths	5s
cargo check (host)	3m 38s
rustfmt	16s
clippy	2m 53s
docs	2m 0s
cargo test (cross x64)	4m 43s
Loom tests (cordyceps)	1m 32s
Miri tests (cordyceps)	2m 37s
Loom tests (maitake)	4m 7s
Miri tests (maitake)	32m 51s
Tests (maitake, no-default-features)	1m 36s
cargo test (host)	4m 25s
build boot image (x86_64)	3m 11s
all_systems_go	0s
	1h 3m 54s

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