RFR: 8270832: Aarch64: Update algorithm annotations for MacroAssembler::fill_words [v2]

[Andrew Haley]

On Tue, 20 Jul 2021 06:36:10 GMT, Wang Huang <whuang at openjdk.org> wrote:

>> It is found that the comments of `MacroAssembler::fill_words` is not right here. Let's fix that.
>
> Wang Huang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fix comments

Marked as reviewed by aph (Reviewer).

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

PR: https://git.openjdk.java.net/jdk/pull/4809