git: openjdk/jdk11u-dev: 8293996: C2: fix and simplify IdealLoopTree::do_remove_empty_loop

[Goetz Lindenmaier]

Changeset: 369dedba
Author:    Goetz Lindenmaier <goetz at openjdk.org>
Date:      2023-01-09 16:24:27 +0000
URL:       https://git.openjdk.org/jdk11u-dev/commit/369dedbaf5320c171e256bebdaf044c948620208

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