git: openjdk/jdk: 8293996: C2: fix and simplify IdealLoopTree::do_remove_empty_loop

[Emanuel Peter]

Changeset: dd51f7e0
Author:    Emanuel Peter <epeter at openjdk.org>
Date:      2022-09-27 08:52:19 +0000
URL:       https://git.openjdk.org/jdk/commit/dd51f7e0b75d3a16403608d89cd206ac0bedf882

8293996: C2: fix and simplify IdealLoopTree::do_remove_empty_loop

Reviewed-by: roland, thartmann, chagedorn

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