Change to make it build with GCC 2.95.3

llvm-svn: 1802
diff --git a/llvm/lib/CodeGen/InstrSched/SchedPriorities.h b/llvm/lib/CodeGen/InstrSched/SchedPriorities.h
index 52b5b9f..f99d7ce 100644
--- a/llvm/lib/CodeGen/InstrSched/SchedPriorities.h
+++ b/llvm/lib/CodeGen/InstrSched/SchedPriorities.h
@@ -27,7 +27,7 @@
 #include "Support/CommandLine.h"
 #include <list>
 #include <ext/hash_set>
-#include <ostream>
+#include <iostream>
 class Method;
 class MachineInstr;
 class SchedulingManager;