RFR: 8374695: ZGC: Convert zTLABUsage to use Atomic<T> [v2]

[Axel Boldt-Christmas]

> Convert usages of AtomicAccess to Atomic<T> in zTLABUsage.
> 
> Testing:
>  * GHA
>  * HotSpot GC tests with ZGC linux x64 and linux aarch64

Axel Boldt-Christmas has updated the pull request incrementally with one additional commit since the last revision:

  Remove superfluous space

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/29271/files
  - new: https://git.openjdk.org/jdk/pull/29271/files/4306b21d..9998cc64

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29271&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29271&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/29271.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29271/head:pull/29271

PR: https://git.openjdk.org/jdk/pull/29271