Fix Object::Clone()'s pre-fence barrier.

Pass in a pre-fence barrier object that sets in the array length
instead of setting it after returning from AllocObject().

Fix another potential bug due to the wrong default pre-fence barrier
parameter value. Since this appears error-prone, removed the default
parameter value and make it an explicit parameter.

Fix another potential moving GC bug due to a lack of a SirtRef.

Bug: 13097759
Change-Id: I466aa0e50f9e1a5dbf20be5a195edee619c7514e
diff --git a/runtime/sirt_ref.h b/runtime/sirt_ref.h
index 2226e17..cf23891 100644
--- a/runtime/sirt_ref.h
+++ b/runtime/sirt_ref.h
@@ -28,7 +28,7 @@
 template<class T>
 class SirtRef {
  public:
-  SirtRef(Thread* self, T* object);
+  SirtRef(Thread* self, T* object, bool should_verify = true);
   ~SirtRef();
 
   T& operator*() const SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
@@ -42,7 +42,8 @@
   }
 
   // Returns the old reference.
-  T* reset(T* object = nullptr) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+  T* reset(T* object = nullptr, bool should_verify = true)
+      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
 
  private:
   Thread* const self_;
@@ -51,6 +52,17 @@
   DISALLOW_COPY_AND_ASSIGN(SirtRef);
 };
 
+// A version of SirtRef which disables the object verification.
+template<class T>
+class SirtRefNoVerify : public SirtRef<T> {
+ public:
+  SirtRefNoVerify(Thread* self, T* object) : SirtRef<T>(self, object, false) {}
+  // Returns the old reference.
+  T* reset(T* object = nullptr) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
+    return SirtRef<T>::reset(object, false);
+  }
+};
+
 }  // namespace art
 
 #endif  // ART_RUNTIME_SIRT_REF_H_