git: openjdk/jdk17u-dev: 8293996: C2: fix and simplify IdealLoopTree::do_remove_empty_loop

[Goetz Lindenmaier]

Changeset: 43668f9c
Author:    Goetz Lindenmaier <goetz at openjdk.org>
Date:      2023-01-02 12:59:20 +0000
URL:       https://git.openjdk.org/jdk17u-dev/commit/43668f9cae4407326b074229529f2083d36e152f

8293996: C2: fix and simplify IdealLoopTree::do_remove_empty_loop

Backport-of: dd51f7e0b75d3a16403608d89cd206ac0bedf882

! src/hotspot/share/opto/loopTransform.cpp
! test/hotspot/jtreg/compiler/loopopts/TestRemoveEmptyLoop.java