RFR: JDK-8303817: Add constexpr for natural malloc alignment

[Justin King]

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On Wed, 8 Mar 2023 14:19:12 GMT, Quan Anh Mai <qamai at openjdk.org> wrote:

> Can we use `alignof(std::max_align_t)` instead? Thanks.

Same request.

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PR: https://git.openjdk.org/jdk/pull/12921