git: openjdk/jdk11u-dev: 8223138: Small clean-up in loop-tree support.

[Goetz Lindenmaier]

Changeset: d86cf10b
Author:    Goetz Lindenmaier <goetz at openjdk.org>
Date:      2021-10-04 20:18:05 +0000
URL:       https://git.openjdk.java.net/jdk11u-dev/commit/d86cf10b3425878f58cfdc7dc725905b4d94bf2f

8223138: Small clean-up in loop-tree support.

Rename predicate 'is_inner()' to 'is_innermost()' to be accurate. Added 'is_root()' predicate for root parent test in loop-tree. Changed definition of 'is_loop()' to always lazy-read the tail, since it should never be NULL. Cleanup of 'tail()' definition.

Backport-of: 205085d8d5143c0d8517bcfc021457492a329c18

! src/hotspot/share/opto/loopTransform.cpp
! src/hotspot/share/opto/loopnode.cpp
! src/hotspot/share/opto/loopnode.hpp