RFR: 8352696: JFR: assert(false): EA: missing memory path [v5]

[Aleksey Shipilev]

On Mon, 24 Mar 2025 19:23:56 GMT, Markus Grönlund <mgronlun at openjdk.org> wrote:

>> Greetings,
>> 
>> In debug builds, we can sometimes assert because C2's Escape Analysis does not recognize a pattern where one input of memory Phi node is a MergeMem node, and another is a RAW store.
>> 
>> This pattern is created by the jdk.jfr.internal.JVM.commit() intrinsic, which is inlined because of inlining JFR events, for example jdk.VirtualThreadStart.
>> 
>> As a result, EA complains about a strange memory graph. 
>> 
>> Testing: jdk_jfr
>> 
>> Thanks
>> Markus
>
> Markus Grönlund has updated the pull request incrementally with one additional commit since the last revision:
> 
>   simplified test

Marked as reviewed by shade (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/24192#pullrequestreview-2712743344