[turbofan] Drop obsolete unused JSStrictNotEqual operator.

src/code-stub-assembler.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_CODE_STUB_ASSEMBLER_H_
 #define V8_CODE_STUB_ASSEMBLER_H_
 
 #include <functional>
 
 #include "src/compiler/code-assembler.h"
@@ skipping 1195 matching lines @@
   void BranchIfNumericRelationalComparison(RelationalComparisonMode mode,
                                            Node* lhs, Node* rhs, Label* if_true,
                                            Label* if_false);
 
   void GotoUnlessNumberLessThan(Node* lhs, Node* rhs, Label* if_false);
 
   enum ResultMode { kDontNegateResult, kNegateResult };
 
   Node* Equal(ResultMode mode, Node* lhs, Node* rhs, Node* context);
 
-  Node* StrictEqual(ResultMode mode, Node* lhs, Node* rhs, Node* context);
+  Node* StrictEqual(Node* lhs, Node* rhs, Node* context);
 
   // ECMA#sec-samevalue
   // Similar to StrictEqual except that NaNs are treated as equal and minus zero
   // differs from positive zero.
   // Unlike Equal and StrictEqual, returns a value suitable for use in Branch
   // instructions, e.g. Branch(SameValue(...), &label).
   Node* SameValue(Node* lhs, Node* rhs, Node* context);
 
   Node* HasProperty(
       Node* object, Node* key, Node* context,
@@ skipping 195 matching lines @@
   }
 #else
 #define CSA_SLOW_ASSERT(csa, x) ((void)0)
 #endif
 
 DEFINE_OPERATORS_FOR_FLAGS(CodeStubAssembler::AllocationFlags);
 
 }  // namespace internal
 }  // namespace v8
 #endif  // V8_CODE_STUB_ASSEMBLER_H_