RFR: 8371956: Convert OopStorage to use Atomic<T> [v2]

[Kim Barrett]

> Please review this change to OopStorage to use Atomic<T> rather than directly
> applying AtomicAccess to volatile members.
> 
> Testing: mach5 tier1-5

Kim Barrett has updated the pull request incrementally with one additional commit since the last revision:

  fixed unintentional load_acquire in test

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/28338/files
  - new: https://git.openjdk.org/jdk/pull/28338/files/554f3229..7f78403f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28338&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28338&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/28338.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28338/head:pull/28338

PR: https://git.openjdk.org/jdk/pull/28338