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

[Daniel D.Daugherty]

On Fri, 13 Nov 2020 22:42:05 GMT, Daniel D. Daugherty <dcubed 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.

Ping! These are comment only changes... Any takers?

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