RFR: 8286476: x86_32: Fix crashes with non-preview mode after JDK-8284161 (Virtual Threads) [v3]

Tue May 10 14:16:45 UTC 2022

On Tue, 10 May 2022 14:06:32 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Virtual Threads are not fully implemented on x86_32. The feature is guarded with `--enable-preview`. But there is some VM code that is executed unconditionally anyway, crashing the VM on some tests. This improves the x86_32 code to the point that tests without `--enable-preview` run successfully. This adds the scaffolding for full implementation too. 
>> 
>> Additional testing:
>>  - [x] Linux x86_32 fastdebug, `tier1` failures only with `--enable-preview`
>>  - [x] Linux x86_32 fastdebug, `tier2` failures only with `--enable-preview`
>
> Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:
> 
>   x86-64 code still a bit wrong

Looks good.  Thanks for fixing this.

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Marked as reviewed by coleenp (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/8630