[CRaC] Avoid error when running with -XX:+PerfDisableSharedMem

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      CRaC tries to unconditionally restore the hsperf file, even if the checkpointed JVM process was started with `-XX:+PerfDisableSharedMem`.

      The fix is trivial: check for the existence of the hsperf file in `PerfMemoryLinux::restore()` just as we already do it in `PerfMemoryLinux::checkpoint()`.

            Assignee:
            Volker Simonis
            Reporter:
            Volker Simonis
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