RFR: 8337415: Remove inappropriate Atomic access in FreeListAllocator

[Thomas Schatzl]

On Tue, 30 Jul 2024 03:23:24 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> Please review this change to ~FreeListAllocator to replace an inappropriate
> use of Atomic::load with a plain access.
> 
> Testing: mach5 tier1

lgtm and trivial.

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Marked as reviewed by tschatzl (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/20382#pullrequestreview-2206947491