[turbofan] Introduce ToBooleanHints on ToBoolean operators.

src/compiler/type-hint-analyzer.h

 // Copyright 2015 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_TYPE_HINT_ANALYZER_H_
 #define V8_COMPILER_TYPE_HINT_ANALYZER_H_
 
+#include "src/compiler/type-hints.h"
 #include "src/handles.h"
-#include "src/utils.h"
 #include "src/zone-containers.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
-// Forward declarations.
-class BinaryOperationHints;
-
-
 // The result of analyzing type hints.
 class TypeHintAnalysis final : public ZoneObject {
  public:
   typedef ZoneMap<TypeFeedbackId, Handle<Code>> Infos;
 
   explicit TypeHintAnalysis(Infos const& infos) : infos_(infos) {}
 
   bool GetBinaryOperationHints(TypeFeedbackId id,
                                BinaryOperationHints* hints) const;
+  bool GetToBooleanHints(TypeFeedbackId id, ToBooleanHints* hints) const;
 
  private:
   Infos const infos_;
 };
 
 
 // The class that performs type hint analysis on the fullcodegen code object.
 class TypeHintAnalyzer final {
  public:
   explicit TypeHintAnalyzer(Zone* zone) : zone_(zone) {}
 
   TypeHintAnalysis* Analyze(Handle<Code> code);
 
  private:
   Zone* zone() const { return zone_; }
 
   Zone* const zone_;
 
   DISALLOW_COPY_AND_ASSIGN(TypeHintAnalyzer);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_TYPE_HINT_ANALYZER_H_