RFR: 8367627: C2: Missed Ideal() optimization opportunity with MemBar [v3]

[Benoît Maillard]

On Mon, 5 Jan 2026 07:43:27 GMT, Christian Hagedorn <chagedorn at openjdk.org> wrote:

>> I guess we could clean this up at some point. We now have `igvn`, `c2/igvn`, and `c2/gvn`. And some other C2 specific tests are in folders inside `c2` while others are in the base directory.
>
> Suggestion:
> 
>  * Copyright (c) 2026, Oracle and/or its affiliates. All rights reserved.
> 
> 
> You are probably also the first one this year to change `node.cpp` and `graphKit.cpp`, so we need an update there as well.

@chhagedorn I filed [JDK-8374511](https://bugs.openjdk.org/browse/JDK-8374511)

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PR Review Comment: https://git.openjdk.org/jdk/pull/28448#discussion_r2660744502