RFR: 8303210: [linux, Windows] Enable UseSystemMemoryBarrier by default if possible [v3]

[Martin Doerr]

On Wed, 1 Mar 2023 04:08:44 GMT, Amit Kumar <duke at openjdk.org> wrote:

> Build and tier1 test are okay with this patch, except one new failure (it could be just a random failure, unrelated to this patch) compiler/jsr292/ContinuousCallSiteTargetChange.java
> 
> But @TheRealMDoerr I'm not sure about how to perform regression, will catch up with Tyler for it and post the result.

Thanks for checking! "ContinuousCallSiteTargetChange.java" often fails. It's probably unrelated. I guess I'll change my plan and only make the feature available for now since there are some drawbacks which prevent us from enabling it by default on all platforms.

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PR: https://git.openjdk.org/jdk/pull/12753