[turbofan] Drop obsolete unused JSStrictNotEqual operator.

src/compiler/verifier.cc

 // Copyright 2014 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/verifier.h"
 
 #include <algorithm>
 #include <deque>
 #include <queue>
 #include <sstream>
@@ skipping 496 matching lines @@
       break;
     case IrOpcode::kTailCall:
       // TODO(bmeurer): what are the constraints on these?
       break;
 
     // JavaScript operators
     // --------------------
     case IrOpcode::kJSEqual:
     case IrOpcode::kJSNotEqual:
     case IrOpcode::kJSStrictEqual:
-    case IrOpcode::kJSStrictNotEqual:
     case IrOpcode::kJSLessThan:
     case IrOpcode::kJSGreaterThan:
     case IrOpcode::kJSLessThanOrEqual:
     case IrOpcode::kJSGreaterThanOrEqual:
       // Type is Boolean.
       CheckTypeIs(node, Type::Boolean());
       break;
 
     case IrOpcode::kJSBitwiseOr:
     case IrOpcode::kJSBitwiseXor:
@@ skipping 1195 matching lines @@
          replacement->op()->EffectOutputCount() > 0);
   DCHECK(!NodeProperties::IsFrameStateEdge(edge) ||
          replacement->opcode() == IrOpcode::kFrameState);
 }
 
 #endif  // DEBUG
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8