RFR: JDK-8296764 NMT: reduce loads in os::malloc [v2]

[Thomas Stuefe]

On Sat, 19 Nov 2022 13:51:20 GMT, Ioi Lam <iklam at openjdk.org> wrote:

>> Thomas Stuefe has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Feedback andrew, ioi
>
> All good. Sorry for the delay.

Thanks @iklam! No worries, we all scramble for 20.

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PR: https://git.openjdk.org/jdk/pull/11080