RFR: 8258838: Remove JVM option UseStackBanging [v3]

[Martin Doerr]

On Fri, 8 Jan 2021 15:01:48 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> Harold Seigel has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   minor comment changes
>
> LGTM

I'm fine with removing the develop flag even though I'd like to have an alternative for stack banging in the future. It still has problems on some platforms (primordial thread on AIX) and a high complexity. And I could even imagine that using explicit compare instructions yields better performance because we could avoid polluting caches with stack banging.
But that's unrelated to this change. I just didn't have time for further investigations so far.

-------------

PR: https://git.openjdk.java.net/jdk/pull/1988