RFR: JDK-8300783: Consolidate byteswap implementations [v3]

[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 two additional commits since the last revision:

 - Update comment to reflect previous commit change
   
   Signed-off-by: Justin King <jcking at google.com>
 - Use __bulitin_bswap for GCC in debug builds
   
   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/592d4f67..36839937

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12114&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12114&range=01-02

  Stats: 6 lines in 1 file changed: 0 ins; 0 del; 6 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