git: openjdk/jdk15u-dev: 8253353: Crash in C2: guarantee(n != NULL) failed: No Node

[Olga Mikhaltsova]

Changeset: 5964d52f
Author:    Olga Mikhaltsova <omikhaltcova at openjdk.org>
Date:      2022-09-02 14:19:33 +0000
URL:       https://git.openjdk.org/jdk15u-dev/commit/5964d52f3cede7f674842f82a902301a96e038a6

8253353: Crash in C2: guarantee(n != NULL) failed: No Node
8260632: Build failures after JDK-8253353

Reviewed-by: yan
Backport-of: 1926765f5e79bfc8db762823c412cf9769ae28eb

! src/hotspot/share/gc/shenandoah/c2/shenandoahSupport.cpp
! src/hotspot/share/opto/loopnode.cpp
! src/hotspot/share/opto/loopnode.hpp
+ test/hotspot/jtreg/compiler/loopopts/TestNestedIrreducibleLoops.jasm
+ test/hotspot/jtreg/compiler/loopopts/TestNestedIrreducibleLoopsMain.java