[turbofan] Add Symbol feedback to Equal/StrictEqual.

src/globals.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_GLOBALS_H_
 #define V8_GLOBALS_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 1251 matching lines @@
     kString = 0x8,
     kAny = 0x1F
   };
 };
 
 // Type feedback is encoded in such a way that, we can combine the feedback
 // at different points by performing an 'OR' operation. Type feedback moves
 // to a more generic type when we combine feedback.
 // kSignedSmall        -> kNumber   -> kAny
 // kInternalizedString -> kString   -> kAny
+//                        kSymbol   -> kAny
 //                        kReceiver -> kAny
 // TODO(epertoso): consider unifying this with BinaryOperationFeedback.
 class CompareOperationFeedback {
  public:
   enum {
     kNone = 0x00,
     kSignedSmall = 0x01,
     kNumber = 0x3,
     kNumberOrOddball = 0x7,
     kInternalizedString = 0x8,
     kString = 0x18,
-    kReceiver = 0x20,
-    kAny = 0x7F
+    kSymbol = 0x20,
+    kReceiver = 0x40,
+    kAny = 0xff
   };
 };
 
 enum class UnicodeEncoding : uint8_t {
   // Different unicode encodings in a |word32|:
   UTF16,  // hi 16bits -> trailing surrogate or 0, low 16bits -> lead surrogate
   UTF32,  // full UTF32 code unit / Unicode codepoint
 };
 
 inline size_t hash_value(UnicodeEncoding encoding) {
@@ skipping 123 matching lines @@
 }  // namespace internal
 }  // namespace v8
 
 // Used by js-builtin-reducer to identify whether ReduceArrayIterator() is
 // reducing a JSArray method, or a JSTypedArray method.
 enum class ArrayIteratorKind { kArray, kTypedArray };
 
 namespace i = v8::internal;
 
 #endif  // V8_GLOBALS_H_