This patch provides for improved alignment of the entry stubs, to avoid 
crossing cache lines.  This is accomplished by using a fixed size for 
each stub (16 bytes for IO-APIC, 8 bytes otherwise).  The fixed size 
allows for removal of the pointer table.  Also, subtracting 256 from the 
irq number is no longer necessary.  orig_eax is no longer used by the 
exit code to distinguish between interrupts and system calls.

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				Brian Gerst