[Chapel Merge] Annotate EX machine noise

Branch: refs/heads/main
Revision: 646462450ce19578c13893f4c4b624352ed162c1
Author: benharsh
Link: Annotate EX machine noise by benharsh · Pull Request #28785 · chapel-lang/chapel · GitHub
Log Message:
Annotate EX machine noise (#28785)

Annotating a performance regression, and its later recovery, due to a
machine-related issue.

Trivial, not reviewed.

Compare: Comparing 7e67ea5405b1be99f32a6a23a525cf32c7f480f4...20ad9a15be0a374bd780facdeb7834db7e1a7913 · chapel-lang/chapel · GitHub

Diff:
M test/ANNOTATIONS.yaml
https://github.com/chapel-lang/chapel/pull/28785.diff