[m-rev.] for review: move pred_origins closer to being a structured pred name

[Zoltan Somogyi]

2022-07-19 19:45 GMT+10:00 "Zoltan Somogyi" <zoltan.somogyi at runbox.com>:
> 2. I intend to move the pred_origin type and its components to a new module.
>    Only a few modules would have to import it, and only those few modules
>    would need to be recompiled if it changes. Since the purpose of these
>    changes is to turn the pred_origin type into a structured pred name,
>    the logical name for the new module would be "pred_name.m". If step 1 above
>    works, pred_origin can be added to pred_name.m. If it doesn't, we would
>    need to put it into another module termporarily, maybe named pred_origin.m,
>    until pred_name.m is eventually subsumed by new code using the moved
>    pred_origin type.

The attached diff does this. For post-commit review by anyone.

Zoltan.
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