git: openjdk/jdk21u-dev: master: 8325372: Shenandoah: SIGSEGV crash in unnecessary_acquire due to LoadStore split through phi

[Paul Hohensee]

Changeset: cc65d0da
Author:    Dan Lutker <dlutker at openjdk.org>
Committer: Paul Hohensee <phh at openjdk.org>
Date:      2024-03-14 22:18:52 +0000
URL:       https://git.openjdk.org/jdk21u-dev/commit/cc65d0da5384d85ecf241c5b089cae4f40df0c00

8325372: Shenandoah: SIGSEGV crash in unnecessary_acquire due to LoadStore split through phi

Reviewed-by: shade
Backport-of: 5d414da50459b7a1e6f0f537ff3b318854b2c427

! src/hotspot/share/gc/shenandoah/c2/shenandoahSupport.cpp
! src/hotspot/share/gc/shenandoah/c2/shenandoahSupport.hpp
! src/hotspot/share/opto/memnode.cpp
+ test/hotspot/jtreg/gc/shenandoah/compiler/TestUnsafeLoadStoreMergedHeapStableTests.java