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

[Markus Grönlund]

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

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Commit messages:
 - 8352696

Changes: https://git.openjdk.org/jdk/pull/24192/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24192&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8352696
  Stats: 125 lines in 2 files changed: 121 ins; 1 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/24192.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24192/head:pull/24192

PR: https://git.openjdk.org/jdk/pull/24192