Release of MI300X simulation capability:
- Implements the required MI300X features over MI200 (currently only
architecture flat scratch).
- Make the gpu-compute model use MI200 features when MI300X / gfx942 is
configured.
- Fix up the scratch_ instructions which are seem to be preferred in
debug hipcc builds over buffer_.
- Add mi300.py config similar to mi200.py. This config can optionally
use resources instead of command line args.
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