git: openjdk/jdk: 8278228: C2: Improve identical back-to-back if elimination

[Roland Westrelin]

Changeset: 8d1a1e83
Author:    Roland Westrelin <roland at openjdk.org>
Date:      2022-01-10 07:52:18 +0000
URL:       https://git.openjdk.java.net/jdk/commit/8d1a1e83f40f7a147e033be6b2221c1bb1abd8ab

8278228: C2: Improve identical back-to-back if elimination

Reviewed-by: chagedorn, kvn

! src/hotspot/share/opto/loopPredicate.cpp
! src/hotspot/share/opto/loopTransform.cpp
! src/hotspot/share/opto/loopUnswitch.cpp
! src/hotspot/share/opto/loopnode.hpp
! src/hotspot/share/opto/loopopts.cpp
! src/hotspot/share/opto/split_if.cpp
+ test/hotspot/jtreg/compiler/c2/irTests/TestBackToBackIfs.java
! test/hotspot/jtreg/compiler/lib/ir_framework/IRNode.java