ART: Use iosfwd more
Use iosfwd where an include of ostream is unnecessary. Also move
callee_save_type.h to runtime.
Bug: 119869270
Test: mmma art
Change-Id: Id8995d6f524e4c491eb6f57fdffb940cf35d291f
diff --git a/runtime/obj_ptr.h b/runtime/obj_ptr.h
index 73a99ab..b0f24da 100644
--- a/runtime/obj_ptr.h
+++ b/runtime/obj_ptr.h
@@ -17,7 +17,7 @@
#ifndef ART_RUNTIME_OBJ_PTR_H_
#define ART_RUNTIME_OBJ_PTR_H_
-#include <ostream>
+#include <iosfwd>
#include <type_traits>
#include "base/locks.h" // For Locks::mutator_lock_.