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G1: replace G1ParallelGCAllocBufferSize with YoungPLABSize and OldPLABSize

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        Right now, the size of all PLABs in G1 (whether they are on survivor or old regions) is determined with the G1ParallelGCAllocBufferSize parameter. This CR proposes to replace the G1-specific parameter with the existing onesX that are used by the other GCs (YoungPLABSize and OldPLABSize). Apart from being more consistent, this way we will also be able to tune the PLAB size separately for survivors and old regions if we need to.

        This is the final part of the work outlined in 6928059.

              apetrusenko Andrey Petrusenko (Inactive)
              tonyp Tony Printezis
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