RFR: JDK-8311261: [AIX] TestAlwaysPreTouchStacks.java fails due to java.lang.RuntimeException: Did not find expected NMT output

[Varada M]

On AIX we are getting the pattern “Stack: “, but the test is expecting the pattern : ".*stack: reserved=(\\d+), committed=(\\d+).*”. This is due to track_as_vm() is returning false on AIX. Thus disabling the test on AIX.

JBS Issue : [JDK-8311261](https://bugs.openjdk.org/browse/JDK-8311261)

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Commit messages:
 - disabling the test on AIX

Changes: https://git.openjdk.org/jdk/pull/14923/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14923&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8311261
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/14923.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14923/head:pull/14923

PR: https://git.openjdk.org/jdk/pull/14923