[Tracing] Implement IC statistics in tracing.

src/ic/ic-state.h

 // Copyright 2012 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_IC_STATE_H_
 #define V8_IC_STATE_H_
 
 #include "src/macro-assembler.h"
 #include "src/parsing/token.h"
 
@@ skipping 64 matching lines @@
     if (Max(left_kind_, right_kind_) == GENERIC) {
       return ::v8::internal::MEGAMORPHIC;
     }
     if (Min(left_kind_, right_kind_) == GENERIC) {
       return ::v8::internal::GENERIC;
     }
     return ::v8::internal::MONOMORPHIC;
   }
 
   ExtraICState GetExtraICState() const;
+  std::string ToString() const;
 
   static void GenerateAheadOfTime(Isolate*,
                                   void (*Generate)(Isolate*,
                                                    const BinaryOpICState&));
 
   // Returns true if the IC _could_ create allocation mementos.
   bool CouldCreateAllocationMementos() const {
     if (left_kind_ == STRING || right_kind_ == STRING) {
       DCHECK_EQ(Token::ADD, op_);
       return true;
@@ skipping 168 matching lines @@
                                                << LanguageModeState::kShift;
 
  private:
   const ExtraICState state_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_IC_STATE_H_