hg: jdk/sandbox: 8246203: Segmentation fault in verification due to stack overflow with -XX:+VerifyIterativeGVN

[chris.hegarty at oracle.com]

Changeset: 49fee4ea8073
Author:    chagedorn
Date:      2020-06-15 09:50 +0200
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/49fee4ea8073

8246203: Segmentation fault in verification due to stack overflow with -XX:+VerifyIterativeGVN
Summary: Replace the recursive verification algorithm with an iterative one to avoid a stack overflow for large graphs.
Reviewed-by: kvn, thartmann

! src/hotspot/share/opto/node.cpp
! src/hotspot/share/opto/node.hpp
! src/hotspot/share/opto/phaseX.cpp
+ test/hotspot/jtreg/compiler/loopopts/TestDeepGraphVerifyIterativeGVN.java