[jdk21u-dev] RFR: 8325372: Shenandoah: SIGSEGV crash in unnecessary_acquire due to LoadStore split through phi [v2]

[Dan Lutker]

> Backporting to 21 which also has the same issue.
> 
> Ran tier1, 2, 3, 4 on linux aarch64 with -XX:+UseShenandoahGC as well as jcstress quick.

Dan Lutker has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge branch 'openjdk:master' into backport-lutkerd-5d414da5
 - Backport 5d414da50459b7a1e6f0f537ff3b318854b2c427

-------------

Changes:
  - all: https://git.openjdk.org/jdk21u-dev/pull/306/files
  - new: https://git.openjdk.org/jdk21u-dev/pull/306/files/b14b74d6..b4c06430

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=306&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=306&range=00-01

  Stats: 2973 lines in 91 files changed: 2304 ins; 374 del; 295 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/306.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/306/head:pull/306

PR: https://git.openjdk.org/jdk21u-dev/pull/306