[turbofan] Drop obsolete unused JSStrictNotEqual operator.

src/compiler/opcodes.h

 // Copyright 2013 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_COMPILER_OPCODES_H_
 #define V8_COMPILER_OPCODES_H_
 
 #include <iosfwd>
 
 #include "src/globals.h"
@@ skipping 65 matching lines @@
 #define COMMON_OP_LIST(V) \
   CONSTANT_OP_LIST(V)     \
   INNER_OP_LIST(V)        \
   V(Dead)
 
 // Opcodes for JavaScript operators.
 #define JS_COMPARE_BINOP_LIST(V) \
   V(JSEqual)                     \
   V(JSNotEqual)                  \
   V(JSStrictEqual)               \
-  V(JSStrictNotEqual)            \
   V(JSLessThan)                  \
   V(JSGreaterThan)               \
   V(JSLessThanOrEqual)           \
   V(JSGreaterThanOrEqual)
 
 #define JS_BITWISE_BINOP_LIST(V) \
   V(JSBitwiseOr)                 \
   V(JSBitwiseXor)                \
   V(JSBitwiseAnd)                \
   V(JSShiftLeft)                 \
@@ skipping 692 matching lines @@
   }
 };
 
 V8_EXPORT_PRIVATE std::ostream& operator<<(std::ostream&, IrOpcode::Value);
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_OPCODES_H_