ART: Do not JNI abort on nullptr GetObjectRefType

A nullptr is a valid input, as it is different from a null reference.

Bug: 18820997
Change-Id: Ibda8907ba13b20d2055049492a356ffdf4ddc714
diff --git a/runtime/jni_internal.cc b/runtime/jni_internal.cc
index 4797e69..37ad46e 100644
--- a/runtime/jni_internal.cc
+++ b/runtime/jni_internal.cc
@@ -2256,8 +2256,10 @@
         java_buffer, WellKnownClasses::java_nio_DirectByteBuffer_capacity));
   }
 
-  static jobjectRefType GetObjectRefType(JNIEnv* env, jobject java_object) {
-    CHECK_NON_NULL_ARGUMENT_RETURN(java_object, JNIInvalidRefType);
+  static jobjectRefType GetObjectRefType(JNIEnv* env ATTRIBUTE_UNUSED, jobject java_object) {
+    if (java_object == nullptr) {
+      return JNIInvalidRefType;
+    }
 
     // Do we definitely know what kind of reference this is?
     IndirectRef ref = reinterpret_cast<IndirectRef>(java_object);
@@ -2274,7 +2276,7 @@
       return JNILocalRefType;
     }
     LOG(FATAL) << "IndirectRefKind[" << kind << "]";
-    return JNIInvalidRefType;
+    UNREACHABLE();
   }
 
  private: