git: openjdk/jdk16: 8253353: Crash in C2: guarantee(n != NULL) failed: No Node

[Vladimir Kozlov]

Changeset: 1926765f
Author:    Vladimir Kozlov <kvn at openjdk.org>
Date:      2021-01-28 16:16:51 +0000
URL:       https://git.openjdk.java.net/jdk16/commit/1926765f

8253353: Crash in C2: guarantee(n != NULL) failed: No Node

Co-authored-by: Fei Yang <fyang at openjdk.org>
Reviewed-by: vlivanov, neliasso

! 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