[turbofan] Add Symbol feedback to Equal/StrictEqual.

src/feedback-vector-inl.h

 // Copyright 2012 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_FEEDBACK_VECTOR_INL_H_
 #define V8_FEEDBACK_VECTOR_INL_H_
 
 #include "src/factory.h"
 #include "src/feedback-vector.h"
 #include "src/globals.h"
@@ skipping 155 matching lines @@
     case CompareOperationFeedback::kSignedSmall:
       return CompareOperationHint::kSignedSmall;
     case CompareOperationFeedback::kNumber:
       return CompareOperationHint::kNumber;
     case CompareOperationFeedback::kNumberOrOddball:
       return CompareOperationHint::kNumberOrOddball;
     case CompareOperationFeedback::kInternalizedString:
       return CompareOperationHint::kInternalizedString;
     case CompareOperationFeedback::kString:
       return CompareOperationHint::kString;
+    case CompareOperationFeedback::kSymbol:
+      return CompareOperationHint::kSymbol;
     case CompareOperationFeedback::kReceiver:
       return CompareOperationHint::kReceiver;
     default:
       return CompareOperationHint::kAny;
   }
   UNREACHABLE();
   return CompareOperationHint::kNone;
 }
 
 void FeedbackVector::ComputeCounts(int* with_type_info, int* generic,
@@ skipping 142 matching lines @@
 #endif
   int index = vector()->GetIndex(slot()) + 1;
   vector()->set(index, feedback_extra, mode);
 }
 
 Isolate* FeedbackNexus::GetIsolate() const { return vector()->GetIsolate(); }
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_FEEDBACK_VECTOR_INL_H_