feat(x86_64): debug commands to print CPUID & MSRs (#492) #1411

Job	Run time
changed_paths	6s
rustfmt	12s
cargo test (host)	4m 40s
clippy	3m 0s
cargo check (host)	3m 29s
build boot image (x86_64)	3m 17s
Loom tests (cordyceps)	1m 33s
Miri tests (cordyceps)	1m 57s
docs	4m 25s
Loom tests (maitake)	4m 15s
Miri tests (maitake)	18m 27s
Tests (maitake, no-default-features)	1m 39s
cargo test (cross x64)	4m 44s
all_systems_go	1s
	51m 45s

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