[turbofan] Add Symbol feedback to Equal/StrictEqual.

src/type-hints.cc

 // 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.
 
 #include "src/type-hints.h"
 
 namespace v8 {
 namespace internal {
 
 std::ostream& operator<<(std::ostream& os, BinaryOperationHint hint) {
@@ skipping 22 matching lines @@
     case CompareOperationHint::kSignedSmall:
       return os << "SignedSmall";
     case CompareOperationHint::kNumber:
       return os << "Number";
     case CompareOperationHint::kNumberOrOddball:
       return os << "NumberOrOddball";
     case CompareOperationHint::kInternalizedString:
       return os << "InternalizedString";
     case CompareOperationHint::kString:
       return os << "String";
+    case CompareOperationHint::kSymbol:
+      return os << "Symbol";
     case CompareOperationHint::kReceiver:
       return os << "Receiver";
     case CompareOperationHint::kAny:
       return os << "Any";
   }
   UNREACHABLE();
   return os;
 }
 
 std::ostream& operator<<(std::ostream& os, ToBooleanHint hint) {
@@ skipping 101 matching lines @@
       return os << "ConvertRight";
     case STRING_ADD_CONVERT:
       break;
   }
   UNREACHABLE();
   return os;
 }
 
 }  // namespace internal
 }  // namespace v8