RFR: 8252835: Revert fix for JDK-8246051

[David Holmes]

On Tue, 22 Sep 2020 16:14:52 GMT, Paul Sandoz <psandoz at openjdk.org> wrote:

>> Reverting JDK-8246051(SIGBUS by unaligned Unsafe compare_and_swap) because it may cause some
>> runtime issues.
>
> Marked as reviewed by psandoz (Reviewer).

The PR title needs to be edited to add a space before "Revert in "8252835:Revert"

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PR: https://git.openjdk.java.net/jdk/pull/297