[CRaC] Avoid two consecutive GCs before checkpointing

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    • Fix Understood

      Currently, we call `System.gc()` in the `beforeCheckpoint()` callback of `java.lang.Reference` and `Universe::heap()->collect(GCCause::_full_gc_alot)` right afterwards in `os::Linux::checkpoint()`.

      It would be preferable if we could combine them into a single full GC.

            Assignee:
            Volker Simonis
            Reporter:
            Volker Simonis
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              Created:
              Updated: