When DTrace is enabled, make sure we don't overwrite the IDT_DTRACE_RET entry with an IRQ for some hardware component.
When DTrace is enabled, make sure we don't overwrite the IDT_DTRACE_RET
entry with an IRQ for some hardware component.

Reviewed by:	jhb
Sponsored by:	The FreeBSD Foundation

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase