remove the last *stream> #include from a public header.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79892 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/llvm-ar/llvm-ar.cpp b/tools/llvm-ar/llvm-ar.cpp
index 95957df..021a369 100644
--- a/tools/llvm-ar/llvm-ar.cpp
+++ b/tools/llvm-ar/llvm-ar.cpp
@@ -24,6 +24,7 @@
 #include <algorithm>
 #include <iomanip>
 #include <memory>
+#include <fstream>
 using namespace llvm;
 
 // Option for compatibility with AIX, not used but must allow it to be present.