[jdk21u-dev] RFR: 8314163: os::print_hex_dump prints incorrectly for big endian platforms and unit sizes larger than 1

[Thomas Stuefe]

Needed to fix gtests for big-endian platforms after [JDK-8299790](https://bugs.openjdk.org/browse/JDK-8299790) backport.

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Commit messages:
 - Backport 6a15860b126c9e9eb62579d9b710dcdc0ec489bb

Changes: https://git.openjdk.org/jdk21u-dev/pull/852/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=852&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8314163
  Stats: 6 lines in 1 file changed: 5 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/852.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/852/head:pull/852

PR: https://git.openjdk.org/jdk21u-dev/pull/852