RFR: 8316050: Use hexadecimal encoding in MemorySegment::toString [v2]

[Per Minborg]

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

Per Minborg has updated the pull request incrementally with one additional commit since the last revision:

  Change from limit to byteSize in MS::toString

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Changes:
  - all: https://git.openjdk.org/jdk/pull/15670/files
  - new: https://git.openjdk.org/jdk/pull/15670/files/ed5c76c9..0a021318

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15670&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15670&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/15670.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15670/head:pull/15670

PR: https://git.openjdk.org/jdk/pull/15670