RFR: 8227369: pd_disjoint_words_atomic() needs to be atomic [v2]

[David Holmes]

On Tue, 1 Mar 2022 08:14:51 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Looks like it was just noise:
>> 
>> Benchmark | MacOSX x64
>> SPECjvm2008-Serial-ParGC | -0.48%
>
>> Looks like it was just noise:
>> 
>> Benchmark | MacOSX x64 SPECjvm2008-Serial-ParGC | -0.48%
> 
> Or intermittent something. Regardless, we can deal with that later. Good to go.

Thanks @shipilev

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PR: https://git.openjdk.java.net/jdk/pull/7567