Make common BitVector operations inline-able.

Change-Id: Ie25de4fae56c6712539f04172c42e3eff57df7ca
diff --git a/runtime/base/bit_vector_test.cc b/runtime/base/bit_vector_test.cc
index 1403f50..df5d79d 100644
--- a/runtime/base/bit_vector_test.cc
+++ b/runtime/base/bit_vector_test.cc
@@ -16,7 +16,8 @@
 
 #include <memory>
 
-#include "bit_vector.h"
+#include "allocator.h"
+#include "bit_vector-inl.h"
 #include "gtest/gtest.h"
 
 namespace art {