refac(hal_x86_64): define ISRs at the top level (#497) #1416

Job	Run time
changed_paths	3s
rustfmt	12s
clippy	2m 51s
cargo test (host)	4m 47s
cargo check (host)	3m 41s
build boot image (x86_64)	3m 15s
Loom tests (cordyceps)	1m 31s
Miri tests (cordyceps)	2m 2s
docs	4m 19s
Loom tests (maitake)	4m 15s
Miri tests (maitake)	18m 23s
Tests (maitake, no-default-features)	1m 38s
cargo test (cross x64)	4m 36s
all_systems_go	1s
	51m 34s

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