Always inline BitCast.

src/utils.h

Index: src/utils.h
diff --git a/src/utils.h b/src/utils.h
index 219343b7fab0fe096c35aae938c781c3f034ff51..b89f2849bfde4d5c2624d94bc14993291ac8608d 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -784,6 +784,9 @@ struct BitCastHelper<Dest, Source*> {
 };
 
 template <class Dest, class Source>
+INLINE(Dest BitCast(const Source& source));
+
+template <class Dest, class Source>
 inline Dest BitCast(const Source& source) {
   return BitCastHelper<Dest, Source>::cast(source);
 }