Replace OStream with std::ostream.

src/ic/ic-state.cc

Index: src/ic/ic-state.cc
diff --git a/src/ic/ic-state.cc b/src/ic/ic-state.cc
index 4238a7237ef88fd25fd39834fa7fe9c9eb8e1c8c..6dcf13d19f1255e395ca9efc9b016eaaed8755d3 100644
--- a/src/ic/ic-state.cc
+++ b/src/ic/ic-state.cc
@@ -28,7 +28,7 @@ ExtraICState CallICState::GetExtraICState() const {
 }
 
 
-OStream& operator<<(OStream& os, const CallICState& s) {
+std::ostream& operator<<(std::ostream& os, const CallICState& s) {
   return os << "(args(" << s.arg_count() << "), "
             << (s.call_type() == CallICState::METHOD ? "METHOD" : "FUNCTION")
             << ", ";
@@ -308,7 +308,7 @@ Type* BinaryOpICState::GetResultType(Zone* zone) const {
 }
 
 
-OStream& operator<<(OStream& os, const BinaryOpICState& s) {
+std::ostream& operator<<(std::ostream& os, const BinaryOpICState& s) {
   os << "(" << Token::Name(s.op_);
   if (s.mode_ == OVERWRITE_LEFT)
     os << "_ReuseLeft";