only affect amd64 and i386. alpha uses "intr N" instead of "irqN" and
mostly has no device names. ia64 uses only device names.
- Edit interrupt names once after they are read from the kernel and not
every time they are displayed.
- Discard bogus trailing spaces so that the next step doesn't move things
to oblivion.
- If an interrupt name starts with "irqN:" (as it usually does in on
amd64 and i386), then move "irqN" to the end and strip ":", since we
have no space for the ":" and don't want to start descriptions with
"N" after stripping "irq" in the next step (since "N" would look like
a count). This step may need reworking for interrupt names containing
several device names -- then moving the irq number to the end would
lose it instead of losing some device names.
- Remove "irq" from an interrupt name if and only if the original name is
too long to display.
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