5045 use atomic_{inc,dec}_* instead of atomic_add_*
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Garrett D'Amore <garrett@damore.org>
Approved by: Robert Mustacchi <rm@joyent.com>

PSARC/2009/104 Hot-Plug Support for ACPI-based Systems
PSARC/2009/550 PSMI Extensions for CPU Hotplug
PSARC/2009/551 acpihpd ACPI Hotplug Daemon
PSARC/2009/591 Attachment Points for Hotpluggable x86

PSARC/2009/104 Hot-Plug Support for ACPI-based Systems
PSARC/2009/550 PSMI Extensions for CPU Hotplug
PSARC/2009/551 acpihpd ACPI Hotplug Daemon
PSARC/2009/591 Attachment Points for Hotpluggable x86 Systems
6862510 provide support for cpu hot add on x86
6883891 cmi interface needs to support dynamic reconfiguration
6884154 x2APIC and kmdb may not function properly during CPU hotplug event.
6904971 low priority acpi nexus code review feedback
6877301 lgrp should support memory hotplug flag in SRAT table

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6755382 new "more linker like" version of lint2 exposes new lint warnings in ON

6684164 fix for 6545999 breaks 32-bit dom0
6683443 xVM panics during boot on systems without acpi
Contributed by Juergen Keil (jk@tools.de)