git: openjdk/jdk17u-dev: 8296545: C2 Blackholes should allow load optimizations

[Aleksey Shipilev]

Changeset: e1326051
Author:    Aleksey Shipilev <shade at openjdk.org>
Date:      2023-04-25 20:15:51 +0000
URL:       https://git.openjdk.org/jdk17u-dev/commit/e132605161ff25cdac0d993ab8ab41f75f367200

8296545: C2 Blackholes should allow load optimizations

Reviewed-by: mdoerr
Backport-of: eab0ada3a16a432fdfd1f0b8fceca149c725451b

! src/hotspot/share/opto/cfgnode.cpp
! src/hotspot/share/opto/cfgnode.hpp
! src/hotspot/share/opto/library_call.cpp
! src/hotspot/share/opto/memnode.cpp
! src/hotspot/share/opto/memnode.hpp
! src/hotspot/share/runtime/vmStructs.cpp
+ test/hotspot/jtreg/compiler/c2/irTests/blackhole/BlackholeLoadOptoTest.java
! test/hotspot/jtreg/compiler/lib/ir_framework/IRNode.java