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Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. scheduler: clean up and simplify equivalence cache locking **What this PR does / why we need it**: This is a cleanup of the locking code for equivalence cache. There is no change to the current logic or locking. This PR has a couple of implications, though. 1. It deletes (unreachable) code that could have been used to cache predicate results that consider nominated pods. 2. Callers should no longer lock/unlock the eCache manually, so coordinating that lock with other synchronization is restricted. **Special notes for your reviewer**: **Release note**: <!-- Write your release note: 1. Enter your extended release note in the below block. If the PR requires additional action from users switching to the new release, include the string "**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*: Fixes # **Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*: Fixes # action required". 2. If no release note is required, just write "NONE". --> ```release-note NONE ``` /sig scheduling /kind cleanup