[jdk21u-dev] RFR: 8319883: Zero: Use atomic built-ins for 64-bit accesses

[Aleksey Shipilev]

Clean backport to fix 32-bit Zero concurrency bug.

Additional testing:
 - [x] Linux x86_32 Zero fastdebug, jcstress run
 - [x] Linux Zero build matrix

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Commit messages:
 - Backport 25f9af99be1c906fc85b8192df8fa50cced3474f

Changes: https://git.openjdk.org/jdk21u-dev/pull/127/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=127&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8319883
  Stats: 63 lines in 2 files changed: 0 ins; 48 del; 15 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/127.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/127/head:pull/127

PR: https://git.openjdk.org/jdk21u-dev/pull/127