xen/intr: hand off closing of ports sooner

[ehem_freebsd_m5p.com]

Summary

Since xi_close now comes along for the ride, move some cases of closing
the port on failure into xen_intr_bind_isrc().

[ehem_freebsd_m5p.com]

Simply exploring some of the potential effects of D31188. Alas moving other close needed instances in is rather more difficult.

[ehem_freebsd_m5p.com]

Updating this in light of other patches having been updated.

[ehem_freebsd_m5p.com]

Updating to match D31188 update.

[ehem_freebsd_m5p.com]

This appears to potentially benefit from D32876 as it means there is no longer a need to use xen_intr_unbind(). There is even more potential for merging things down, but this needs to be done with care. Alas, this doesn't appear to benefit my main goal.

[ehem_freebsd_m5p.com]

Finally figured out how to do this, D33622/D33623/D33624 are how. Some functions were using xen_intr_unbind() since they needed the handler removed before calling xen_intr_release_isrc(), D33622 addresses the issue. Then simply cleaning things up.

[ehem_freebsd_m5p.com]

Updating to current tree status.

[ehem_freebsd_m5p.com]

Updating to present tree status. Like the others in this sequence, suddenly a distinct approach has a massive impact.