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

[Martin Doerr]

Clean backport of jdk17u version of [JDK-8290004](https://bugs.openjdk.org/browse/JDK-8290004)

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Commit messages:
 - Backport ccc4732eeb706980d2f7f92aec3835f60d146126

Changes: https://git.openjdk.org/jdk11u-dev/pull/1221/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1221&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/1221.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1221/head:pull/1221

PR: https://git.openjdk.org/jdk11u-dev/pull/1221