RFR: 8322890: Directly return in OldPLABSizeConstraintFunc

[Lei Zaakjyu]

Description:
One can directly return `MinMaxPLABSizeBounds("OldPLABSize", value, verbose)` without introducing a local variable.

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Commit messages:
 - remove 'status'

Changes: https://git.openjdk.org/jdk/pull/17246/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17246&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8322890
  Stats: 7 lines in 1 file changed: 0 ins; 6 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/17246.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17246/head:pull/17246

PR: https://git.openjdk.org/jdk/pull/17246