RFR: 8333791: Fix memory barriers for @Stable fields [v3]

[Chen Liang]

On Fri, 16 Aug 2024 04:47:42 GMT, Quan Anh Mai <qamai at openjdk.org> wrote:

>> Isn't membar additions already checked with `is_object_initializer()` or `method()->name() == ciSymbols::object_initializer_name()`?
>
> Yes we only emit membars at the end of constructors but we do not check if the stable fields being written are of the same objects as the ones being constructed there.

That should be still fine, as this shouldn't affect performance-sensitive fast paths.

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PR Review Comment: https://git.openjdk.org/jdk/pull/19635#discussion_r1719327139