[turbofan] Add Symbol feedback to Equal/StrictEqual.

src/compiler/simplified-operator.cc

 // 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.
 
 #include "src/compiler/simplified-operator.h"
 
 #include "src/base/lazy-instance.h"
 #include "src/compiler/opcodes.h"
 #include "src/compiler/operator.h"
 #include "src/compiler/types.h"
@@ skipping 512 matching lines @@
 
 #define CHECKED_OP_LIST(V)              \
   V(CheckBounds, 2, 1)                  \
   V(CheckHeapObject, 1, 1)              \
   V(CheckIf, 1, 0)                      \
   V(CheckInternalizedString, 1, 1)      \
   V(CheckNumber, 1, 1)                  \
   V(CheckReceiver, 1, 1)                \
   V(CheckSmi, 1, 1)                     \
   V(CheckString, 1, 1)                  \
+  V(CheckSymbol, 1, 1)                  \
   V(CheckTaggedHole, 1, 1)              \
   V(CheckedInt32Add, 2, 1)              \
   V(CheckedInt32Sub, 2, 1)              \
   V(CheckedInt32Div, 2, 1)              \
   V(CheckedInt32Mod, 2, 1)              \
   V(CheckedUint32Div, 2, 1)             \
   V(CheckedUint32Mod, 2, 1)             \
   V(CheckedUint32ToInt32, 1, 1)         \
   V(CheckedUint32ToTaggedSigned, 1, 1)  \
   V(CheckedInt32ToTaggedSigned, 1, 1)   \
@@ skipping 476 matching lines @@
                         Operator::kNoDeopt | Operator::kNoThrow | properties,  \
                         #Name, value_input_count, 1, control_input_count,      \
                         output_count, 1, 0, access);                           \
   }
 ACCESS_OP_LIST(ACCESS)
 #undef ACCESS
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8