RFR: 8295872: [PPC64] JfrGetCallTrace: Need pc == nullptr check before frame constructor [v2]

[Matthias Baesken]

On Mon, 31 Oct 2022 11:53:38 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

>> The check pc == nullptr is needed before the frame constructor.
>
> Martin Doerr has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove acquire barrier again. The null check is the clean fix.

Marked as reviewed by mbaesken (Reviewer).

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PR: https://git.openjdk.org/jdk/pull/10846