Juggled Debug.h from ObjCARC.h to only the including cpp files that
actually have DEBUG statements. Also changed raw_ostream in said header
to be a forward declaration (removing an include).

llvm-svn: 173769
diff --git a/llvm/lib/Transforms/ObjCARC/ObjCARC.h b/llvm/lib/Transforms/ObjCARC/ObjCARC.h
index 32ca30e..2b90496 100644
--- a/llvm/lib/Transforms/ObjCARC/ObjCARC.h
+++ b/llvm/lib/Transforms/ObjCARC/ObjCARC.h
@@ -30,13 +30,15 @@
 #include "llvm/IR/Module.h"
 #include "llvm/Pass.h"
 #include "llvm/Support/CallSite.h"
-#include "llvm/Support/Debug.h"
 #include "llvm/Support/InstIterator.h"
-#include "llvm/Support/raw_ostream.h"
 #include "llvm/Transforms/ObjCARC.h"
 #include "llvm/Transforms/Utils/Local.h"
 
 namespace llvm {
+class raw_ostream;
+}
+
+namespace llvm {
 namespace objcarc {
 
 /// \brief A handy option to enable/disable all ARC Optimizations.