RFR: 8261445: Use memory_order_relaxed for os::random().

[Martin Doerr]

On Tue, 9 Feb 2021 14:49:12 GMT, Andrew Haley <aph at openjdk.org> wrote:

> os::random() is used a lot (once for every class) during HotSpot initialization, and it defaults to using a compare-and-swap operation with memory_order_conservative. We don't need that: it should be memory_order_relaxed.

Looks like a nice improvement!

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Marked as reviewed by mdoerr (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/2484