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

lib/Support/Streams.cpp

@@ -19,3 +19,12 @@ using namespace llvm;
 OStream llvm::cout(std::cout);
 OStream llvm::cerr(std::cerr);
 IStream llvm::cin(std::cin);
+
+namespace llvm {
+
+/// FlushStream - Function called by BaseStream to flush an ostream.
+void FlushStream(std::ostream &S) {
+  S << std::flush;
+}
+
+} // end anonymous namespace