[jdk11u-dev] RFR: 8290004: [PPC64] JfrGetCallTrace: assert(_pc != nullptr) failed: must have PC

[Martin Doerr]

Backport version from 17u. Adaptation for 11u: `load_acquire` is in class `OrderAccess` instead of `Atomic`.

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Commit messages:
 - Adapt for 11u: load_acquire is in class OrderAccess instead of Atomic
 - Backport ccc4732eeb706980d2f7f92aec3835f60d146126

Changes: https://git.openjdk.org/jdk11u-dev/pull/1222/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1222&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8290004
  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1222.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1222/head:pull/1222

PR: https://git.openjdk.org/jdk11u-dev/pull/1222