RFR: 8365017: The SegmentBulkOperations::copy method can be improved using overlaps

[Per Minborg]

On Thu, 7 Aug 2025 10:05:42 GMT, Per Minborg <pminborg at openjdk.org> wrote:

> This PR proposes to use overlapping memory areas in `SegmentBulkOperations::copy`similar ', similar to what is proposed for `SegmentBulkOperations::fill` in https://github.com/openjdk/jdk/pull/25383.

<img width="840" height="517" alt="image" src="https://github.com/user-attachments/assets/1ae82fe1-ebcd-472b-8180-1358033b7a2f" />

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PR Comment: https://git.openjdk.org/jdk/pull/26672#issuecomment-3163503769