RFR: JDK-8311822: AIX : test/jdk/java/foreign/TestLayouts.java fails because of different output - expected [[i4](struct)] but found [[I4](struct)]

[Per Minborg]

This PR suggests making a test independent of the underlying platform byte ordering and to test both ordering variants rather than just one.

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Commit messages:
 - Make test independent of platform byte ordering

Changes: https://git.openjdk.org/jdk/pull/14994/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14994&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8311822
  Stats: 7 lines in 1 file changed: 3 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/14994.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14994/head:pull/14994

PR: https://git.openjdk.org/jdk/pull/14994