More of the concurrent copying collector.

Bug: 12687968
Change-Id: I62f70274d47df6d6cab714df95c518b750ce3105
diff --git a/runtime/gc/collector/immune_region.h b/runtime/gc/collector/immune_region.h
index 277525e..30144f0 100644
--- a/runtime/gc/collector/immune_region.h
+++ b/runtime/gc/collector/immune_region.h
@@ -57,6 +57,13 @@
     UpdateSize();
   }
 
+  mirror::Object* Begin() {
+    return begin_;
+  }
+  mirror::Object* End() {
+    return end_;
+  }
+
  private:
   bool IsEmpty() const {
     return size_ == 0;