RFR: 8370240: [PPC64] jhsdb jstack cannot handle continuation stub [v2]

[Martin Doerr]

On Tue, 21 Oct 2025 09:07:30 GMT, David Briemann <dbriemann at openjdk.org> wrote:

>> This is a port of 8369979 for PPC. It allows to calculate caller SP from `CodeBlob` for continuation stub.
>> It also enables the test `test/hotspot/jtreg/serviceability/sa/TestJhsdbJstackWithVirtualThread.java` for PPC.
>
> David Briemann has updated the pull request incrementally with one additional commit since the last revision:
> 
>   remove unnecessary requires

LGTM.

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Marked as reviewed by mdoerr (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/27902#pullrequestreview-3359624622