[Tracing] Implement IC statistics in tracing.

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 f94803681bb8d6f8350f8f421386331cd051a887..7439ecd2c0610c31f4c29b6c2fcfb19cc9507b9d 100644
--- a/src/ic/ic-state.cc
+++ b/src/ic/ic-state.cc
@@ -61,6 +61,23 @@ ExtraICState BinaryOpICState::GetExtraICState() const {
   return extra_ic_state;
 }
 
+std::string BinaryOpICState::ToString() const {
+  std::string ret = "(";
+  ret += Token::Name(op_);
+  if (CouldCreateAllocationMementos()) ret += "_CreateAllocationMementos";
+  ret += ":";
+  ret += BinaryOpICState::KindToString(left_kind_);
+  ret += "*";
+  if (fixed_right_arg_.IsJust()) {
+    ret += fixed_right_arg_.FromJust();
+  } else {
+    ret += BinaryOpICState::KindToString(right_kind_);
+  }
+  ret += "->";
+  ret += BinaryOpICState::KindToString(result_kind_);
+  ret += ")";
+  return ret;
+}
 
 // static
 void BinaryOpICState::GenerateAheadOfTime(