Investigate test-primops failure on CI

Summary

I've noticed this test-primops failure: https://gitlab.haskell.org/ghc/test-primops/-/jobs/2117142

It would be good to classify if this is a known defect, new bug, or something else at least.

added needs triage label

This is test-primops#8.

mentioned in merge request !14034

added Phigh Tbug incorrect runtime result primops labels and removed needs triage label

changed milestone to %9.14.1