Commits on Dec 21, 2023

1. ensure write barrier in last step of vector-sort! …

   The old `$vector-copy!` could use `$ptr-copy!`, which doesn't have an
   associated write barrier. As a result, using `$vector-copy!` at the
   end of `vector-sort!` is incorrect.
   
   The new test is arranges for one half of a vector to have generation-0
   objects and the other to have immediate objects; the two halves are
   already sorted, so they end up being swapped via a temporary vector
   and `$vector-copy!`. As a result, a collection afterward can fail to
   scan the half of the original vector that it should scan.
   
   The solution here is to rename the internal `$vector-copy!` function
   to `$vector-fill-copy!` (by analogy to `$stencil-vector-fill-set!`)
   and use keep using it for things like `vector-copy`. But the new
   `$vector-copy!` as used by `vector-sort!` avoids `$ptr-copy!`.

   

   mflatt committed Dec 21, 2023
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