[jdk11u-dev] RFR: 8293998: [PPC64] JfrGetCallTrace: assert(_pc != nullptr) failed: must have PC

[Goetz Lindenmaier]

I backport this for parity with 11.0.19-oracle.

Resolved Copyright in test file, will mark as clean.

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Commit messages:
 - Backport 14c6ac457d319a2e7f9cc9e7355c81c421a065dd

Changes: https://git.openjdk.org/jdk11u-dev/pull/1628/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1628&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293998
  Stats: 65 lines in 2 files changed: 38 ins; 17 del; 10 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1628.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1628/head:pull/1628

PR: https://git.openjdk.org/jdk11u-dev/pull/1628