[jdk11u] RFR: 8304389: [11u] Crash on Windows in C2 compiled code after 8248238 and 8218431

[Goetz Lindenmaier]

On Fri, 17 Mar 2023 22:53:04 GMT, Dean Long <dlong at openjdk.org> wrote:

>> … 8218431
>> 
>> A required fix to avoid regression in 11.0.19. See JBS issue.
>
> It sounds like the real problem is the #ifdef _WIN64 in x86_64.ad.  If that code is wrong for 64-bit Windows, shouldn't it be removed?

Hi @dean-long 
I am not yet completely sure what is really wrong. The point is that the test only crashes in 11 since we enabled the #ifdef by accident.  It is enabled in 16+, too, but going back all the way to starting development of 16 we don't have a single crash in that code.  In 11, it is 100% reproducible. So I assumed there is another part missing that should be backported, too.
As release of 11.0.19 is coming up, I first want to undo the change in 11 to avoid the regression.

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PR: https://git.openjdk.org/jdk11u/pull/70