x86_64 interrupt handling

[macpacheco]

long mode interrupt handler activation saves:
RIP, CS, RFLAGS, RSP, SS
There's no need for PUSHFQ on interrupt handlers.
https://www.felixcloutier.com/x86/iret:iretd:iretq
I'm disabling interrupts first thing on my handlers, and never reactivating it, and the assembly code produced by gcc has zero push/pop flags.

[IanSeyler]

Good catch! I've removed the pushfq/popfq opcodes.