RFR: 8254264: Remove redundant cross_modify_fence()

[Daniel D.Daugherty]

On Mon, 19 Oct 2020 22:10:49 GMT, Patricio Chilano Mateo <pchilanomate at openjdk.org> wrote:

>> Thumbs up! Had to read through the comments a couple of
>> times along with the code before I convinced myself all was
>> okay. Thanks for testing Mach5 Tier[1-7].
>
>> Thumbs up! Had to read through the comments a couple of
>> times along with the code before I convinced myself all was
>> okay. Thanks for testing Mach5 Tier[1-7].
> 
> Thanks Dan!

Why is the commit history only showing a single commit if there was a merge in the past?
(I might be missing something trivial here since I'm still a GitHub newbie.)

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PR: https://git.openjdk.java.net/jdk/pull/655