[turbofan] Add Symbol feedback to Equal/StrictEqual.

src/deoptimize-reason.h

 // Copyright 2016 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_DEOPTIMIZE_REASON_H_
 #define V8_DEOPTIMIZE_REASON_H_
 
 #include "src/globals.h"
 
 namespace v8 {
@@ skipping 31 matching lines @@
   V(MinusZero, "minus zero")                                                 \
   V(NaN, "NaN")                                                              \
   V(NegativeKeyEncountered, "Negative key encountered")                      \
   V(NegativeValue, "negative value")                                         \
   V(NoCache, "no cache")                                                     \
   V(NotAHeapNumber, "not a heap number")                                     \
   V(NotAHeapNumberUndefined, "not a heap number/undefined")                  \
   V(NotAJavaScriptObject, "not a JavaScript object")                         \
   V(NotANumberOrOddball, "not a Number or Oddball")                          \
   V(NotASmi, "not a Smi")                                                    \
+  V(NotASymbol, "not a Symbol")                                              \
   V(OutOfBounds, "out of bounds")                                            \
   V(OutsideOfRange, "Outside of range")                                      \
   V(Overflow, "overflow")                                                    \
   V(Proxy, "proxy")                                                          \
   V(ReceiverWasAGlobalObject, "receiver was a global object")                \
   V(Smi, "Smi")                                                              \
   V(TooManyArguments, "too many arguments")                                  \
   V(TracingElementsTransitions, "Tracing elements transitions")              \
   V(TypeMismatchBetweenFeedbackAndConstant,                                  \
     "Type mismatch between feedback and constant")                           \
@@ skipping 23 matching lines @@
 std::ostream& operator<<(std::ostream&, DeoptimizeReason);
 
 size_t hash_value(DeoptimizeReason reason);
 
 char const* DeoptimizeReasonToString(DeoptimizeReason reason);
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_DEOPTIMIZE_REASON_H_