[turbofan] Introduce ToBooleanHints on ToBoolean operators.

src/compiler/js-operator.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_COMPILER_JS_OPERATOR_H_
 #define V8_COMPILER_JS_OPERATOR_H_
 
 #include "src/compiler/type-hints.h"
 #include "src/runtime/runtime.h"
 
@@ skipping 26 matching lines @@
   const FeedbackVectorSlot slot_;
 };
 
 bool operator==(VectorSlotPair const&, VectorSlotPair const&);
 bool operator!=(VectorSlotPair const&, VectorSlotPair const&);
 
 size_t hash_value(VectorSlotPair const&);
 
 
 // The ConvertReceiverMode is used as parameter by JSConvertReceiver operators.
-ConvertReceiverMode ConvertReceiverModeOf(const Operator* op);
+ConvertReceiverMode ConvertReceiverModeOf(Operator const* op);
+
+
+// The ToBooleanHints are used as parameter by JSToBoolean operators.
+ToBooleanHints ToBooleanHintsOf(Operator const* op);
 
 
 // Defines whether tail call optimization is allowed.
 enum class TailCallMode : unsigned { kAllow, kDisallow };
 
 size_t hash_value(TailCallMode);
 
 std::ostream& operator<<(std::ostream&, TailCallMode);
 
 
@@ skipping 432 matching lines @@
   const Operator* Add(LanguageMode language_mode, BinaryOperationHints hints);
   const Operator* Subtract(LanguageMode language_mode,
                            BinaryOperationHints hints);
   const Operator* Multiply(LanguageMode language_mode,
                            BinaryOperationHints hints);
   const Operator* Divide(LanguageMode language_mode,
                          BinaryOperationHints hints);
   const Operator* Modulus(LanguageMode language_mode,
                           BinaryOperationHints hints);
 
-  const Operator* ToBoolean();
+  const Operator* ToBoolean(ToBooleanHints hints);
   const Operator* ToNumber();
   const Operator* ToString();
   const Operator* ToName();
   const Operator* ToObject();
   const Operator* Yield();
 
   const Operator* Create();
   const Operator* CreateArguments(CreateArgumentsParameters::Type type,
                                   int start_index);
   const Operator* CreateArray(size_t arity, Handle<AllocationSite> site);
@@ skipping 70 matching lines @@
   Zone* const zone_;
 
   DISALLOW_COPY_AND_ASSIGN(JSOperatorBuilder);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_JS_OPERATOR_H_