RFR: 8303210: [linux, Windows] Make UseSystemMemoryBarrier available as product flag [v5]

[Martin Doerr]

On Wed, 29 Mar 2023 00:03:21 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> src/hotspot/os/aix/os_aix.cpp line 2228:
>> 
>>> 2226:   if (UseSystemMemoryBarrier) {
>>> 2227:     if (!SystemMemoryBarrier::initialize()) {
>>> 2228:       if (!FLAG_IS_DEFAULT(UseSystemMemoryBarrier)) {
>> 
>> Have we processed this flag by this stage?
>
> This really should be done once in shared code, as well - somewhere in arguments.cpp

This is the leftover. See below.

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PR Review Comment: https://git.openjdk.org/jdk/pull/12753#discussion_r1151737392