RFR: 8322890: Directly return in OldPLABSizeConstraintFunc

[Albert Mingkun Yang]

On Wed, 3 Jan 2024 15:43:19 GMT, Lei Zaakjyu <duke at openjdk.org> wrote:

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

Marked as reviewed by ayang (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/17246#pullrequestreview-1802523829