hg: valhalla/valhalla: fix checkcast with value types

[rwestrel at redhat.com]

Changeset: 66b5e022cb6a
Author:    roland
Date:      2018-05-04 16:59 +0200
URL:       http://hg.openjdk.java.net/valhalla/valhalla/rev/66b5e022cb6a

fix checkcast with value types

! src/hotspot/share/opto/graphKit.cpp
! src/hotspot/share/opto/memnode.cpp
! src/hotspot/share/opto/parseHelper.cpp
! test/hotspot/jtreg/compiler/valhalla/valuetypes/TestLWorld.java