RFR: 8134630: make code and comments consistent for stack lock optimization

[Daniel D.Daugherty]

On Mon, 16 Nov 2020 22:34:07 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> Comment only changes copied from the 'arm' version to the aarch64 and x86
>> versions of the files. I looked at the ppc and s390 files and it wasn't at all clear
>> to me how to apply the same comment changes to those platforms.
>
> Seems fine.
> Thanks,
> David

@dholmes-ora - Thanks for the review!

I didn't flag this one as "trivial" because the comments are related to
assembly code so trivial didn't feel right. It would be good to get a
second pair of eyes on this (long overdue) comment cleanup.

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PR: https://git.openjdk.java.net/jdk/pull/1210