RFR: 8294920: Missing SP value in Linux x86_32 thread context

[Chris Plummer]

On Thu, 6 Oct 2022 18:59:57 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> See the description in the bug. This fixes only Linux x86_32, because only there I could reproduce the failure. Windows x86_32 seems to be fine. I have no access to BSD x86_32.
> 
> Additional testing:
>  - [x] Linux x86 fastdebug `serviceability/sa` now cleanly passes

[JDK-8208091](https://bugs.openjdk.org/browse/JDK-8208091) also addressed windows-x86. Any reason not to do the same here? I see bsd-x86 was neglected for [JDK-8208091](https://bugs.openjdk.org/browse/JDK-8208091). Would have been nice if it hadn't been just to keep the ports consistent, although I'm not sure if anyone cares about bsd-x86.

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PR: https://git.openjdk.org/jdk/pull/10598