[jdk17u-dev] RFR: 8274615: Support relaxed atomic add for linux-aarch64

[Aleksey Shipilev]

Clean backport to unlock AArch64-specific performance improvements in VM code.

Additional testing:
 - [ ] Linux AArch64 fastdebug `tier1 tier2 tier3`

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Commit messages:
 - Backport 8de26361f7d789c7b317536198c891756038a8ea

Changes: https://git.openjdk.org/jdk17u-dev/pull/1383/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1383&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8274615
  Stats: 64 lines in 4 files changed: 51 ins; 0 del; 13 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1383.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1383/head:pull/1383

PR: https://git.openjdk.org/jdk17u-dev/pull/1383