Keep natives source code in external strings instead of putting...

src/objects-inl.h

Index: src/objects-inl.h
===================================================================
--- src/objects-inl.h	(revision 3220)
+++ src/objects-inl.h	(working copy)
@@ -163,11 +163,6 @@
 }
 
 
-#ifdef DEBUG
-// These are for cast checks.  If you need one of these in release
-// mode you should consider using a StringShape before moving it out
-// of the ifdef
-
 bool Object::IsSeqString() {
   if (!IsString()) return false;
   return StringShape(String::cast(this)).IsSequential();
@@ -214,9 +209,6 @@
 }
 
 
-#endif  // DEBUG
-
-
 StringShape::StringShape(String* str)
   : type_(str->map()->instance_type()) {
   set_valid();