RFR: JDK-8330024: [AIX] replace my_disclaim64 helper by direct call to disclaim64

Wed Apr 10 13:01:36 UTC 2024

Currently we use a helper function my_disclaim64 to simulate disclaim64.
The reason documented in the source code was support of (very) old AIX versions. However AIX 7.1 and higher support disclaim64 so the workaround seems to be obsolete.
See
https://www.ibm.com/docs/en/aix/7.1?topic=d-disclaim-disclaim64-subroutines
https://www.ibm.com/docs/en/aix/7.2?topic=d-disclaim-disclaim64-subroutines

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Commit messages:
 - JDK-8330024

Changes: https://git.openjdk.org/jdk/pull/18720/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18720&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8330024
  Stats: 44 lines in 1 file changed: 1 ins; 40 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/18720.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18720/head:pull/18720

PR: https://git.openjdk.org/jdk/pull/18720