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4000'0000h is the hypervisor CPUID information leaf, can just return all
zeroes to imply we aren't running under a hypervisor
EAX: The maximum input value for CPUID supported by the hypervisor.
- We return zero here to signify no Hypervisor
EBX, ECX, EDX: Vedor ID signature
CPUID 4000'0001h - 4000'000Fh is reserved for hypervisor, which we don't
need to expose since we return zero in EAX