Don't use <sstream> in Streams.h but <iosfwd> instead.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32340 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/CommandLine.cpp b/lib/Support/CommandLine.cpp
index 920811a..012f759 100644
--- a/lib/Support/CommandLine.cpp
+++ b/lib/Support/CommandLine.cpp
@@ -24,6 +24,7 @@
 #include <algorithm>
 #include <functional>
 #include <map>
+#include <ostream>
 #include <set>
 #include <cstdlib>
 #include <cerrno>