[turbofan] Drop obsolete unused JSStrictNotEqual operator.

src/interpreter/interpreter.cc

 // Copyright 2015 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/interpreter/interpreter.h"
 
 #include <fstream>
 #include <memory>
 
 #include "src/ast/prettyprinter.h"
@@ skipping 1287 matching lines @@
   switch (compare_op) {
     case Token::EQ:
       result = assembler->Equal(CodeStubAssembler::kDontNegateResult, lhs, rhs,
                                 context);
       break;
     case Token::NE:
       result =
           assembler->Equal(CodeStubAssembler::kNegateResult, lhs, rhs, context);
       break;
     case Token::EQ_STRICT:
-      result = assembler->StrictEqual(CodeStubAssembler::kDontNegateResult, lhs,
-                                      rhs, context);
+      result = assembler->StrictEqual(lhs, rhs, context);
       break;
     case Token::LT:
       result = assembler->RelationalComparison(CodeStubAssembler::kLessThan,
                                                lhs, rhs, context);
       break;
     case Token::GT:
       result = assembler->RelationalComparison(CodeStubAssembler::kGreaterThan,
                                                lhs, rhs, context);
       break;
     case Token::LTE:
@@ skipping 2060 matching lines @@
   __ StoreObjectField(generator, JSGeneratorObject::kContinuationOffset,
       __ SmiTag(new_state));
   __ SetAccumulator(old_state);
 
   __ Dispatch();
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8