Replace OStream with std::ostream.

src/hydrogen-gvn.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_HYDROGEN_GVN_H_
 #define V8_HYDROGEN_GVN_H_
 
+#include <iosfwd>
+
 #include "src/compiler.h"
 #include "src/hydrogen.h"
 #include "src/hydrogen-instructions.h"
 #include "src/zone.h"
 
 namespace v8 {
 namespace internal {
 
-class OStream;
-
 // This class extends GVNFlagSet with additional "special" dynamic side effects,
 // which can be used to represent side effects that cannot be expressed using
 // the GVNFlags of an HInstruction. These special side effects are tracked by a
 // SideEffectsTracker (see below).
 class SideEffects FINAL {
  public:
   static const int kNumberOfSpecials = 64 - kNumberOfFlags;
 
   SideEffects() : bits_(0) {
     DCHECK(kNumberOfFlags + kNumberOfSpecials == sizeof(bits_) * CHAR_BIT);
@@ skipping 35 matching lines @@
 // SideEffects class (see above). This way unrelated global variable/inobject
 // field stores don't prevent hoisting and merging of global variable/inobject
 // field loads.
 class SideEffectsTracker FINAL BASE_EMBEDDED {
  public:
   SideEffectsTracker() : num_global_vars_(0), num_inobject_fields_(0) {}
   SideEffects ComputeChanges(HInstruction* instr);
   SideEffects ComputeDependsOn(HInstruction* instr);
 
  private:
-  friend OStream& operator<<(OStream& os, const TrackedEffects& f);
+  friend std::ostream& operator<<(std::ostream& os, const TrackedEffects& f);
   bool ComputeGlobalVar(Unique<Cell> cell, int* index);
   bool ComputeInobjectField(HObjectAccess access, int* index);
 
   static int GlobalVar(int index) {
     DCHECK(index >= 0);
     DCHECK(index < kNumberOfGlobalVars);
     return index;
   }
   static int InobjectField(int index) {
     DCHECK(index >= 0);
@@ skipping 16 matching lines @@
 
 // Helper class for printing, because the effects don't know their tracker.
 struct TrackedEffects {
   TrackedEffects(SideEffectsTracker* t, SideEffects e)
       : tracker(t), effects(e) {}
   SideEffectsTracker* tracker;
   SideEffects effects;
 };
 
 
-OStream& operator<<(OStream& os, const TrackedEffects& f);
+std::ostream& operator<<(std::ostream& os, const TrackedEffects& f);
 
 
 // Perform common subexpression elimination and loop-invariant code motion.
 class HGlobalValueNumberingPhase FINAL : public HPhase {
  public:
   explicit HGlobalValueNumberingPhase(HGraph* graph);
 
   void Run();
 
  private:
@@ skipping 24 matching lines @@
   // Used when collecting side effects on paths from dominator to
   // dominated.
   BitVector visited_on_paths_;
 
   DISALLOW_COPY_AND_ASSIGN(HGlobalValueNumberingPhase);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_GVN_H_