Record ToBoolean's type information in Hydrogen's HBranch instruction, so we can use it in LCodeG...

src/code-stubs.h

 // Copyright 2011 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 915 matching lines @@
     void Add(Type type) { set_.Add(type); }
     byte ToByte() const { return set_.ToIntegral(); }
     void Print(StringStream* stream);
     void TraceTransition(Types to);
     bool Record(Handle<Object> object);
 
    private:
     EnumSet<Type, byte> set_;
   };
 
+  static Types no_types() { return Types(); }
+
   explicit ToBooleanStub(Register tos, Types types = Types())
       : tos_(tos), types_(types) { }
 
   void Generate(MacroAssembler* masm);
   virtual int GetCodeKind() { return Code::TO_BOOLEAN_IC; }
   virtual void PrintName(StringStream* stream);
 
  private:
   Major MajorKey() { return ToBoolean; }
   int MinorKey() { return (tos_.code() << NUMBER_OF_TYPES) | types_.ToByte(); }
 
   virtual void FinishCode(Code* code) {
     code->set_to_boolean_state(types_.ToByte());
   }
 
   void CheckOddball(MacroAssembler* masm,
                     Type type,
                     Handle<Object> value,
                     bool result,
                     Label* patch);
   void GenerateTypeTransition(MacroAssembler* masm);
 
   Register tos_;
   Types types_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_CODE_STUBS_H_