hg: valhalla/valhalla: 8240177: [lworld] C2: Use macro nodes for subtype checks

[tobias.hartmann at oracle.com]

Changeset: 62830cc42bfe
Author:    thartmann
Date:      2020-03-02 10:41 +0100
URL:       https://hg.openjdk.java.net/valhalla/valhalla/rev/62830cc42bfe

8240177: [lworld] C2: Use macro nodes for subtype checks

! src/hotspot/share/c1/c1_GraphBuilder.cpp
! src/hotspot/share/ci/ciKlass.hpp
! src/hotspot/share/ci/ciObjArrayKlass.hpp
! src/hotspot/share/opto/c2_globals.hpp
! src/hotspot/share/opto/graphKit.cpp
! src/hotspot/share/opto/macro.cpp
! src/hotspot/share/opto/memnode.cpp
! src/hotspot/share/opto/parse2.cpp
! src/hotspot/share/opto/subnode.cpp
! src/hotspot/share/opto/subtypenode.cpp
! src/hotspot/share/opto/type.cpp
! src/hotspot/share/opto/type.hpp
! test/hotspot/jtreg/compiler/valhalla/valuetypes/TestNullableArrays.java