RFR: JDK-8300783: Consolidate byteswap implementations [v6]

[Justin King]

> Deduplicate byte swapping implementations by consolidating them into `utilities/byteswap.hpp`, following `std::byteswap` introduced in C++23. Further simplification of `Bytes` will follow in https://github.com/openjdk/jdk/pull/12078.

Justin King has updated the pull request incrementally with one additional commit since the last revision:

  Cleanup Bytes::swap_uN
  
  Signed-off-by: Justin King <jcking at google.com>

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/12114/files
  - new: https://git.openjdk.org/jdk/pull/12114/files/9986ce35..4e98d704

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12114&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12114&range=04-05

  Stats: 118 lines in 9 files changed: 5 ins; 88 del; 25 mod
  Patch: https://git.openjdk.org/jdk/pull/12114.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12114/head:pull/12114

PR: https://git.openjdk.org/jdk/pull/12114