Fix #377: Provide a stable ordering for results

[mdboom]

Cc: @Yhg1s

[Copilot]

Pull Request Overview

This PR aims to fix ordering inconsistencies by ensuring that result items always follow a stable order. The changes introduce a tuple conversion for flags and filename as a tie-breaker in sorting, and update filename parsing in plotting.

• In bench_runner/result.py, tuple(x.flags) and x.filename have been added to the sorting key.
• In bench_runner/plot.py, the functions retrieving results have been updated to use from_arbitrary_filename.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
bench_runner/result.py	Adds tuple conversion of flags and filename to enforce stable order
bench_runner/plot.py	Updates result retrieval to use from_arbitrary_filename

Comments suppressed due to low confidence (1)

bench_runner/plot.py:488

• Ensure that the new function 'from_arbitrary_filename' is covered by tests to verify that it handles all expected filename scenarios consistently with previous behavior.

ref = result.Result.from_arbitrary_filename(Path(args.ref))