o os_boot_rendez is responsible for clearing the IRR bit by

   reading cr.ivr, as well as writing to cr.eoi.
o  use global variables to pass information to os_boot_rendez
   so that it doesn't have to jump through hoops to find it
   out. This avoids traps on the AP without it even being
   initialized. This fixes SMP configurations.
o  Move the probing of the MADT to the end of cpu_startup,
   instead of at the start of cpu_mp_probe. We need to probe
   the MADT for non-SMP configurations as well. This fixes
   uniprocessor configurations.
o  Serialize AP wake-up by waiting for the AP. We need to do
   this since we use global variables to for the AP to use.
   As a side-effect, we can use printf() more easily to see
   what's going on.

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