git: openjdk/jdk: 8272112: Arena code simplifications

[Thomas Stuefe]

Changeset: d06d0b9e
Author:    Thomas Stuefe <stuefe at openjdk.org>
Date:      2021-08-13 06:38:08 +0000
URL:       https://git.openjdk.java.net/jdk/commit/d06d0b9e9d9d27aa549455f19b9803752431bcbb

8272112: Arena code simplifications

Reviewed-by: kbarrett, coleenp

! src/hotspot/share/memory/arena.cpp
! src/hotspot/share/runtime/init.cpp
! test/hotspot/gtest/memory/test_arena.cpp