Fix an outstanding compaction bug in interpreter.

Fixed a bug in DoFieldPut where the FieldHelper GetType could cause
thread suspension which would result in a stale obj.

Added more handles in the class linker to facilitate moving fiels
and methods in the future.

Removed un-necessarly passing handle references since these are value
types and don't need to be passed by reference.

Added a special NullHandle type which allows null handles without a
handle scope.

Change-Id: I1b51723920a2e4f4f8b2907066f578a3e879fd5b
diff --git a/runtime/mirror/array.h b/runtime/mirror/array.h
index 1b8106e..64e2317 100644
--- a/runtime/mirror/array.h
+++ b/runtime/mirror/array.h
@@ -38,8 +38,8 @@
                       bool fill_usable = false)
       SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
 
-  static Array* CreateMultiArray(Thread* self, const Handle<Class>& element_class,
-                                 const Handle<IntArray>& dimensions)
+  static Array* CreateMultiArray(Thread* self, Handle<Class> element_class,
+                                 Handle<IntArray> dimensions)
       SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
 
   template<VerifyObjectFlags kVerifyFlags = kDefaultVerifyFlags,