Commits on Oct 11, 2020

1. Adjust how ArchetypeAccess tracks mutable & immutable deps …

   `ArchetypeAccess` was tracking `immutable` and `mutable` separately.
   This means that checking is_compatible requires three checks:
   m+m, m+i, i+m.
   
   Instead, continue tracking `mutable` accesses, but instead of
   `immutable` track `immutable | mutable` as another `accessed` bit mask.
   This drops the comparisons to two (m+a, a+m) and turns out to be
   what the rest of the code base wants too, unifying various duplicated
   checks and loops.

   

   mjhostet committed Oct 11, 2020
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