[jdk21u-dev] RFR: 8320052: Zero: Use __atomic built-ins for atomic RMW operations

[Aleksey Shipilev]

Clean backport to improve Atomic support in JDK 21, and prepare for [JDK-8316961](https://bugs.openjdk.org/browse/JDK-8316961) backport.

Additional testing:
 - [x] Large matrix of Zero builds
 - [x] Linux x86_32 Zero fastdebug jcstress run

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Commit messages:
 - Backport 020c9007f8e9cc4b46a58d7955284f43a6ac913b

Changes: https://git.openjdk.org/jdk21u-dev/pull/227/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=227&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8320052
  Stats: 213 lines in 4 files changed: 2 ins; 201 del; 10 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/227.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/227/head:pull/227

PR: https://git.openjdk.org/jdk21u-dev/pull/227