[Chapel Merge] IFC: prep for hashtable tests

Branch: refs/heads/main
Revision: 3943ee4
Author: vasslitvinov
Log Message:

Merge pull request #17998 from vasslitvinov/ic-seed-ht-tests

IFC: prep for hashtable tests

I am adding unmodified versions of ChapelHashtable.chpl and
test-chpl-hashtable.chpl as tests. I will use these versions
as a baseline to compare against in my upcoming interfaces PR.

Not reviewed.

Modified Files:
A test/constrained-generics/hashtable/MyHashtable.chpl

A test/constrained-generics/hashtable/NOTEST
A test/constrained-generics/hashtable/test-chpl-hashtable.chpl

Compare: https://github.com/chapel-lang/chapel/compare/7d1af8efa693...3943ee4288bc