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  1. JDK
  2. JDK-8367765

G1: Merge G1UpdateRegionLivenessAndSelectForRebuild task and collection set choosing

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      G1UpdateRegionLivenessAndSelectForRebuild almost completely does the collection set choosing work (in the parallel phase, ie G1BuildCandidateRegionsTask), but then defers storing the actual regions.

      Just make G1UpdateRegionLivenessAndSelectForRebuild store the actual regions and drop that second parallel phase.

            tschatzl Thomas Schatzl
            tschatzl Thomas Schatzl
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