RFR: 8290892: C2: Intrinsify Reference.reachabilityFence [v8]

[Vladimir Ivanov]

On Wed, 10 Sep 2025 21:46:17 GMT, Vladimir Ivanov <vlivanov at openjdk.org> wrote:

>> You could mention that `Identity` will remove the node later.
>
>> Also: do you need the return value? The only use case does not do anything with it.
> 
> I decided to keep it for diagnostic purposes even though no existing callers care about it.

> You could mention that Identity will remove the node later.

Done.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25315#discussion_r2337989216