git: openjdk/jdk: 8280126: C2: detect and remove dead irreducible loops

[Emanuel Peter]

Changeset: ac7119f0
Author:    Emanuel Peter <epeter at openjdk.org>
Date:      2023-02-08 07:45:09 +0000
URL:       https://git.openjdk.org/jdk/commit/ac7119f0d5319a3fb44dc67a938c3e1eb21b9202

8280126: C2: detect and remove dead irreducible loops

Reviewed-by: kvn, chagedorn, thartmann

! src/hotspot/share/ci/ciTypeFlow.cpp
! src/hotspot/share/ci/ciTypeFlow.hpp
! src/hotspot/share/opto/cfgnode.cpp
! src/hotspot/share/opto/cfgnode.hpp
! src/hotspot/share/opto/loopnode.cpp
! src/hotspot/share/opto/loopnode.hpp
! src/hotspot/share/opto/memnode.cpp
! src/hotspot/share/opto/parse.hpp
! src/hotspot/share/opto/parse1.cpp
! src/hotspot/share/opto/phaseX.cpp
+ test/hotspot/jtreg/compiler/loopopts/TestDeadIrreducibleLoops.jasm
+ test/hotspot/jtreg/compiler/loopopts/TestDeadIrreducibleLoopsMain.java