hg: jdk-updates/jdk15u: 8253756: C2 CompilerThread0 crash in Node::add_req(Node*)

[tobias.hartmann at oracle.com]

Changeset: b3df2cab8bcc
Author:    roland
Date:      2020-11-17 08:29 +0100
URL:       https://hg.openjdk.java.net/jdk-updates/jdk15u/rev/b3df2cab8bcc

8253756: C2 CompilerThread0 crash in Node::add_req(Node*)
Summary: Change the behavior OuterStripMinedLoopEndNode::Value() so it blocks constant folding only until expansion but not after.
Reviewed-by: vlivanov, thartmann

! src/hotspot/share/opto/loopnode.cpp
! src/hotspot/share/opto/loopnode.hpp
+ test/hotspot/jtreg/compiler/loopstripmining/TestOuterStripMinedDeadAfterExpansion.java