git: openjdk/jdk: 8306321: Add an accessor for the top of a PLAB

[Y. Srinivas Ramakrishna]

Changeset: ed34e7f5
Author:    William Kemper <wkemper at openjdk.org>
Committer: Y. Srinivas Ramakrishna <ysr at openjdk.org>
Date:      2023-04-19 18:32:48 +0000
URL:       https://git.openjdk.org/jdk/commit/ed34e7f5aeb1d38d3a26d6bbd4c69624b0662cfb

8306321: Add an accessor for the top of a PLAB

Reviewed-by: shade, ysr

! src/hotspot/share/gc/shared/plab.hpp