RFR: JDK-8314163: os::print_hex_dump prints incorrectly for big endian platforms and unit sizes larger than 1

[Thomas Stuefe]

See comment. Seen on AIX. Big-endian is a pain.

Thanks to @MBaesken for testing the patch.

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Commit messages:
 - start

Changes: https://git.openjdk.org/jdk/pull/15256/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15256&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8314163
  Stats: 7 lines in 2 files changed: 5 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/15256.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15256/head:pull/15256

PR: https://git.openjdk.org/jdk/pull/15256