RFR: 8339386: Assertion on AIX - original PC must be in the main code section of the compiled method

[Lutz Schmidt]

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On Wed, 25 Sep 2024 19:20:22 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

> We should make sure to read the `sender_pc` only once to make it signal safe (e.g. using `volatile`). Now, we can check if it is a deopt PC and if so, if the original PC is within the nmethod.
> In case of interpreter frame on top of compiled deoptimized frame we need to use the unextendedSP (2nd commit).

LGTM.

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Marked as reviewed by lucy (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/21189#pullrequestreview-2349523450