In order to be able to proceed checks on CPU-specific properties
within the emulator, function "get_cpuid" is introduced.
With "get_cpuid" it is possible to virtually call the guests
"cpuid"-opcode without changing the VM's context.

[mtosatti: cleanup/beautify code]
Signed-off-by: NStephan Baerwolf <stephan.baerwolf@tu-ilmenau.de>
Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>