[jdk21u-dev] RFR: 8349729 : [21u] AIX jtreg tests fail to compile with qvisibility=hidden

[Suchismith Roy]

JBS ISSUE : [JDK-8349729](https://bugs.openjdk.org/browse/JDK-8349729)

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Commit messages:
 - remove qvisibility for xlc16

Changes: https://git.openjdk.org/jdk21u-dev/pull/1425/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1425&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8349729
  Stats: 2 lines in 1 file changed: 0 ins; 2 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1425.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1425/head:pull/1425

PR: https://git.openjdk.org/jdk21u-dev/pull/1425