RFR: 8344954: Linker tests fails on BE platforms after JDK-8340205

[Per Minborg]

This PR proposes to fix some tests that fails on big-endian platforms.

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Commit messages:
 - Fix failing tests

Changes: https://git.openjdk.org/jdk/pull/22362/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22362&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8344954
  Stats: 6 lines in 1 file changed: 0 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/22362.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22362/head:pull/22362

PR: https://git.openjdk.org/jdk/pull/22362