[turbofan] Introduce ToBooleanHints on ToBoolean operators.

src/compiler/type-hints.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_HINTS_H_
 #define V8_COMPILER_TYPE_HINTS_H_
 
+#include "src/base/flags.h"
 #include "src/utils.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 // Type hints for an binary operation.
 class BinaryOperationHints final {
  public:
   enum Hint { kNone, kSignedSmall, kSigned32, kNumber, kString, kAny };
@@ skipping 26 matching lines @@
   typedef BitField<Hint, 0, 3> LeftField;
   typedef BitField<Hint, 3, 3> RightField;
   typedef BitField<Hint, 6, 3> ResultField;
 
   uint32_t bit_field_;
 };
 
 std::ostream& operator<<(std::ostream&, BinaryOperationHints::Hint);
 std::ostream& operator<<(std::ostream&, BinaryOperationHints);
 
+
+// Type hints for the ToBoolean type conversion.
+enum class ToBooleanHint : uint16_t {
+  kNone = 0u,
+  kUndefined = 1u << 0,
+  kBoolean = 1u << 1,
+  kNull = 1u << 2,
+  kSmallInteger = 1u << 3,
+  kReceiver = 1u << 4,
+  kString = 1u << 5,
+  kSymbol = 1u << 6,
+  kHeapNumber = 1u << 7,
+  kSimdValue = 1u << 8,
+  kAny = kUndefined | kBoolean | kNull | kSmallInteger | kReceiver | kString |
+         kSymbol | kHeapNumber | kSimdValue
+};
+
+std::ostream& operator<<(std::ostream&, ToBooleanHint);
+
+typedef base::Flags<ToBooleanHint, uint16_t> ToBooleanHints;
+
+std::ostream& operator<<(std::ostream&, ToBooleanHints);
+
+DEFINE_OPERATORS_FOR_FLAGS(ToBooleanHints)
+
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_TYPE_HINTS_H_