Fix a few issues with multi-chip designs

Tile Notification Nodes

* adding getOMComponents to ports

* fixing formatting

* created a new getOMPortMemoryRegions

* cosmetic

Major changes:
* Target (Named deprecated)
* RegisteredTransform
* Cats herded in emitted Verilog
* Bug fixes

Fix event covers to eliminate dead covers

Priv arch enhancements

groupBy considered harmful

This flushes the D$.  It is only meant for power-down and it is only
supported on systems without S-mode.

After retiring this instruction, no further instructions will retire
until reset (including debugging).

We'll leave the old definitions for a short grace period.

Clock-gate the debug module using the dmactive signal

Power queues