RFR: 8316050: Use hexadecimal encoding in MemorySegment::toString

[Roger Riggs]

On Mon, 11 Sep 2023 21:17:27 GMT, Per Minborg <pminborg at openjdk.org> wrote:

> This PR proposes to use hexadecimal representation for a memory segment address rather than a decimal one.

Seems more natural.

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Marked as reviewed by rriggs (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/15670#pullrequestreview-1620876854