Use AST's type field and merge types for unary, binary & compare ICs

src/type-info.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 281 matching lines @@
   // of various cycles in our headers. Death to tons of implementations in
   // headers!! :-P
   byte ToBooleanTypes(TypeFeedbackId id);
 
   // Get type information for arithmetic operations and compares.
   Handle<Type> UnaryType(TypeFeedbackId id);
   void BinaryType(TypeFeedbackId id,
                   Handle<Type>* left,
                   Handle<Type>* right,
                   Handle<Type>* result,
-                  bool* has_fixed_right_arg,
-                  int* fixed_right_arg_value);
+                  Maybe<int>* fixed_right_arg);
 
-  void CompareTypes(TypeFeedbackId id,
-                    Handle<Type>* left_type,
-                    Handle<Type>* right_type,
-                    Handle<Type>* overall_type,
-                    Handle<Type>* compare_nil_type);
+  void CompareType(TypeFeedbackId id,
+                   Handle<Type>* left_type,
+                   Handle<Type>* right_type,
+                   Handle<Type>* combined_type);
 
   Handle<Type> ClauseType(TypeFeedbackId id);
 
   TypeInfo IncrementType(CountOperation* expr);
 
   Zone* zone() const { return zone_; }
   Isolate* isolate() const { return isolate_; }
 
  private:
   void CollectReceiverTypes(TypeFeedbackId ast_id,
@@ skipping 24 matching lines @@
   Isolate* isolate_;
   Zone* zone_;
   Handle<UnseededNumberDictionary> dictionary_;
 
   DISALLOW_COPY_AND_ASSIGN(TypeFeedbackOracle);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_TYPE_INFO_H_