[Chapel Merge] Add comments to astlocT fields and reorder them

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Branch: refs/heads/main
Revision: bddeb36
Author: mppf
Link: Add comments to astlocT fields and reorder them by mppf · Pull Request #20709 · chapel-lang/chapel · GitHub
Log Message:

Merge pull request #20709 from mppf/comment-astlocs

Add comments to astlocT fields and reorder them

Added comments to clarify how these fields are used.
Reordered the fields to make the most used field first.

Reviewed by @dlongnecke-cray - thanks!