[Bug 46870] League of Legends 8.12+ fails to start a game in Vista+ mode ( anticheat engine, SystemExtendedProcessInformation)

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=46870

--- Comment #50 from Paul Gofman <gofmanp at gmail.com> ---
Created attachment 64154
  --> https://bugs.winehq.org/attachment.cgi?id=64154
xaudio2_7: Preserve EBX in call_on_voice_processing_pass_start().

I could not help looking into this intriguing issue a bit more and found that
the problem is that the IXAudio2VoiceCallback_OnVoiceProcessingPassStart
callback does not preserve EBX register. It is apparently not the first time
such callbacks are naughty this way, as there is already a workaround
preserving %esi for EVE Online.  I am attaching the patch (on top of Staging)
which fixes the issue for me.

There is the same callback with the same workaround for EVE online called in
mainstream FAudio xaudio, but the problem is not there as the code is entirely
different and function just ends after this callback call, so it apparently
does not need that EBX anymore. Yet if anyone confirms that this patch is
fixing the crash with some tricky build, it probably worth doing it there also.

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