git: openjdk/jdk17u-dev: 8296412: Special case infinite loops with unmerged backedges in IdealLoopTree::check_safepts

[Goetz Lindenmaier]

Changeset: ee63f83e
Author:    Goetz Lindenmaier <goetz at openjdk.org>
Date:      2023-04-25 09:55:28 +0000
URL:       https://git.openjdk.org/jdk17u-dev/commit/ee63f83ed705c9cd3c49316fc4936668744f415d

8296412: Special case infinite loops with unmerged backedges in IdealLoopTree::check_safepts

Backport-of: da38d43fcc640ea9852db6c7c23817dcef7080d5

! src/hotspot/share/opto/loopnode.cpp
+ test/hotspot/jtreg/compiler/loopopts/TestInfiniteLoopWithUnmergedBackedges.jasm
+ test/hotspot/jtreg/compiler/loopopts/TestInfiniteLoopWithUnmergedBackedgesMain.java