Delay TempSymbol cleanup to avoid symbol table churn

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        Dacapo pmd benchmark (`java -jar dacapo-9.12-MR1.jar --size large --iterations 20 pmd`) regressed 5-20% on all platforms.

        This is caused by JDK-8313678, which fixed a symbol leak, but the leak was actually beneficial to performance in some cases as it allowed cheap temp symbol re-use instead of churning symbols with the associated cleanup and recreation cost.

          1. 8315559-flame-comparison.png
            8315559-flame-comparison.png
            264 kB
          2. symbol-delay-queue.patch
            5 kB

              Assignee:
              Oli Gillespie
              Reporter:
              Eric Caspole
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                Created:
                Updated:
                Resolved: