RFR: 8291555: Implement alternative fast-locking scheme [v75]

[Roman Kennke]

On Fri, 5 May 2023 14:53:32 GMT, Daniel D. Daugherty <dcubed at openjdk.org> wrote:

>> src/hotspot/cpu/aarch64/c1_LIRAssembler_aarch64.cpp line 2562:
>> 
>>> 2560:   Register lock = op->lock_opr()->as_register();
>>> 2561:   if (LockingMode == LM_MONITOR) {
>>> 2562:     if (op->info() != null) {
>> 
>> Hmmm... other places in the same file compare `op->info()` with `nullptr` and not `null`.
>
> I have absolutely no idea why the above diff showed up when I went to view the
> changes for the zero fix. It's not present in the zero fix webrev, but it was in the
> "Review new changes" link... sigh... this GitHub thing mystifies me...

It's also interesting that it compiled :-) What is 'null' anyway?
In any case, I am doing a scan of the whole patch and look for any possible re-introduction of NULL or even null.

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PR Review Comment: https://git.openjdk.org/jdk/pull/10907#discussion_r1186199522