Remove more iostream header includes. Needed to implement a "FlushStream"

function to flush a specified std::ostream.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51705 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Support/Streams.h

@@ -19,6 +19,9 @@
 
 namespace llvm {
 
+  /// FlushStream - Function called by BaseStream to flush an ostream.
+  void FlushStream(std::ostream &S);
+
   /// BaseStream - Acts like the STL streams. It's a wrapper for the std::cerr,
   /// std::cout, std::cin, etc. streams. However, it doesn't require #including
   /// @verbatim <iostream> @endverbatm in every file (doing so increases static 
@@ -39,6 +42,11 @@ namespace llvm {
       return *this;
     }
 
+    void flush() {
+      if (Stream)
+        FlushStream(*Stream);
+    }
+
     template <typename Ty>
     BaseStream &operator << (const Ty &Thing) {
       if (Stream) *Stream << Thing;