hg: jdk/hs: 8195690: JNI GetObjectRefType doesn't handle NULL

[kim.barrett at oracle.com]

Changeset: 2b0b7f222800
Author:    kbarrett
Date:      2018-01-23 14:27 -0500
URL:       http://hg.openjdk.java.net/jdk/hs/rev/2b0b7f222800

8195690: JNI GetObjectRefType doesn't handle NULL
Summary: Properly handle NULL, add some non-NULL preconditions.
Reviewed-by: dholmes, mdoerr

! src/hotspot/share/gc/shared/oopStorage.cpp
! src/hotspot/share/gc/shared/oopStorage.hpp
! src/hotspot/share/prims/jni.cpp
! src/hotspot/share/prims/jniCheck.cpp
! src/hotspot/share/runtime/jniHandles.cpp
! src/hotspot/share/runtime/jniHandles.hpp
! src/hotspot/share/runtime/os.cpp