RFR: 8292608: [AIX] Broken build after 8291945

[Tyler Steele]

Improvements to the os class for AIX contained a minor bug.


- _page_sizes.add(AIX::_page_size);
+ _page_sizes.add(os::vm_page_size);


`AIX::_page_size` is an `int`, but `os::vm_page_size` is a `() -> int`. Adding the parens (changing vm_page_size to a function call) does the trick.

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Commit messages:
 - Replace fn reference with fn call

Changes: https://git.openjdk.org/jdk/pull/9922/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9922&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8292608
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/9922.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9922/head:pull/9922

PR: https://git.openjdk.org/jdk/pull/9922