Make common BitVector operations inline-able.

Change-Id: Ie25de4fae56c6712539f04172c42e3eff57df7ca
diff --git a/compiler/optimizing/ssa_liveness_analysis.cc b/compiler/optimizing/ssa_liveness_analysis.cc
index fbdc0b9..5de1ab9 100644
--- a/compiler/optimizing/ssa_liveness_analysis.cc
+++ b/compiler/optimizing/ssa_liveness_analysis.cc
@@ -16,6 +16,7 @@
 
 #include "ssa_liveness_analysis.h"
 
+#include "base/bit_vector-inl.h"
 #include "code_generator.h"
 #include "nodes.h"