Parallelize the Free CSet phase in G1

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      JDK-8027295 observes that the Free CSet phase of young gen GC on large heaps takes a significant amount of time.

      There is a prototype that improves the serial performance by tweaking the code, and another one based on the former parallelizing parts of this phase.

      This CR is a split-out of the parallelization efforts. The changes in JDK-8027295 are prerequisites for parallelization.

        1. par-free-cset
          24 kB
        2. par-free-cset2
          21 kB

            Assignee:
            Thomas Schatzl
            Reporter:
            Thomas Schatzl
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