Fix recent breakage when compiling under elf. _Xforward_irq         -> Xforward_irq _apic_isrbit_location -> apic_isrbit_location _cpu_num_to_apic_id   -> cpu_num_to_apic_id _invltlb_ok           -> invltlb_ok
Fix recent breakage when compiling under elf.
_Xforward_irq         -> Xforward_irq
_apic_isrbit_location -> apic_isrbit_location
_cpu_num_to_apic_id   -> cpu_num_to_apic_id
_invltlb_ok           -> invltlb_ok

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