hg: jdk/sandbox: 8238691: C2: turn subtype check into macro node

[chris.hegarty at oracle.com]

Changeset: efc0da4a10a9
Author:    roland
Date:      2020-02-14 10:31 +0100
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/efc0da4a10a9

8238691: C2: turn subtype check into macro node
Reviewed-by: vlivanov, thartmann

! src/hotspot/share/opto/c2_globals.hpp
! src/hotspot/share/opto/classes.cpp
! src/hotspot/share/opto/classes.hpp
! src/hotspot/share/opto/compile.cpp
! src/hotspot/share/opto/escape.cpp
! src/hotspot/share/opto/graphKit.cpp
! src/hotspot/share/opto/graphKit.hpp
! src/hotspot/share/opto/library_call.cpp
! src/hotspot/share/opto/loopnode.cpp
! src/hotspot/share/opto/loopopts.cpp
! src/hotspot/share/opto/macro.cpp
! src/hotspot/share/opto/macro.hpp
! src/hotspot/share/opto/macroArrayCopy.cpp
! src/hotspot/share/opto/node.hpp
! src/hotspot/share/opto/phase.hpp
! src/hotspot/share/opto/subnode.cpp
+ src/hotspot/share/opto/subtypenode.cpp
+ src/hotspot/share/opto/subtypenode.hpp