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/suspend_reason.h b/runtime/suspend_reason.h
index 289a1a4..af2be10 100644
--- a/runtime/suspend_reason.h
+++ b/runtime/suspend_reason.h
@@ -17,7 +17,7 @@
 #ifndef ART_RUNTIME_SUSPEND_REASON_H_
 #define ART_RUNTIME_SUSPEND_REASON_H_
 
-#include <ostream>
+#include <iosfwd>
 
 namespace art {