i386 now has shared IRQ support

[Joel Sherrill]

Hi,

I just committed the modifications required
to support shared IRQs on the i386.  This should
put the PowerPC and x86 IRQ processing at
feature parity.

It now looks like there is an opportunity to
eliminate some of the shared code across the
two ports irq.c files.

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joel.sherrill at OARcorp.com        On-Line Applications Research
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