G1: Move copy before CAS in do_copy_to_survivor_space

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      Propose to move copy before CAS in do_copy_to_survivor_space, as we found this will improve G1 performance. Specjbb shows 3.7% in critical on aarch64, no change in max.
      (For JDK 11, the improvement is better.)

      After this change copy_to_survivor in G1 is also aligned with PS's copy_to_survivor.

        1. g1_move_copy_before_cas_aarch64.png
          g1_move_copy_before_cas_aarch64.png
          13 kB
        2. g1_move_copy_before_cas_x86.png
          g1_move_copy_before_cas_x86.png
          10 kB

            Assignee:
            Hamlin Li
            Reporter:
            Hamlin Li
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              Created:
              Updated:
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