cache: always release ref when getting size in usage. #3851
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Noticed a few cache refs leaked occasionally during long running tests. Debugged by changing
immutableRefandmutableRefto store the stack trace of the caller when they are created, saw that it leaked on the lines fixed here.I considered whether we should leave the stack traces in those data structures but I saw it was taking up a ton of memory, so probably best for local debugging only for now cc @tonistiigi