RFR: 8329997: Add MemorySegment::reinterpretate overloads for alignment constraints

[Per Minborg]

This PR proposes to add two overloads `MemorySegment::reinterpretate` to allow aligned reinterpretation.

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Commit messages:
 - Update copyright year
 - Add MemorySegment::reinterpretate overloads for alignment constraints

Changes: https://git.openjdk.org/jdk/pull/18717/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18717&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8329997
  Stats: 126 lines in 6 files changed: 111 ins; 2 del; 13 mod
  Patch: https://git.openjdk.org/jdk/pull/18717.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18717/head:pull/18717

PR: https://git.openjdk.org/jdk/pull/18717