[turbofan] Drop obsolete unused JSStrictNotEqual operator.

src/compiler/ast-graph-builder.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/ast-graph-builder.h"
 
 #include "src/ast/compile-time-value.h"
 #include "src/ast/scopes.h"
 #include "src/compilation-info.h"
 #include "src/compiler.h"
@@ skipping 1978 matching lines @@
   switch (expr->op()) {
     case Token::EQ:
       op = javascript()->Equal(hint);
       break;
     case Token::NE:
       op = javascript()->NotEqual(hint);
       break;
     case Token::EQ_STRICT:
       op = javascript()->StrictEqual(hint);
       break;
-    case Token::NE_STRICT:
-      op = javascript()->StrictNotEqual(hint);
-      break;
     case Token::LT:
       op = javascript()->LessThan(hint);
       break;
     case Token::GT:
       op = javascript()->GreaterThan(hint);
       break;
     case Token::LTE:
       op = javascript()->LessThanOrEqual(hint);
       break;
     case Token::GTE:
@@ skipping 797 matching lines @@
       NumberMatcher m(input);
       return jsgraph_->BooleanConstant(!m.Is(0) && !m.IsNaN());
     }
     case IrOpcode::kHeapConstant: {
       Handle<HeapObject> object = HeapObjectMatcher(input).Value();
       return jsgraph_->BooleanConstant(object->BooleanValue());
     }
     case IrOpcode::kJSEqual:
     case IrOpcode::kJSNotEqual:
     case IrOpcode::kJSStrictEqual:
-    case IrOpcode::kJSStrictNotEqual:
     case IrOpcode::kJSLessThan:
     case IrOpcode::kJSLessThanOrEqual:
     case IrOpcode::kJSGreaterThan:
     case IrOpcode::kJSGreaterThanOrEqual:
     case IrOpcode::kJSToBoolean:
     case IrOpcode::kJSDeleteProperty:
     case IrOpcode::kJSHasProperty:
     case IrOpcode::kJSInstanceOf:
       return input;
     default:
@@ skipping 354 matching lines @@
     float invocation_frequency, LoopAssignmentAnalysis* loop_assignment,
     SourcePositionTable* source_positions, int inlining_id)
     : AstGraphBuilder(local_zone, info, jsgraph, invocation_frequency,
                       loop_assignment),
       source_positions_(source_positions),
       start_position_(info->shared_info()->start_position(), inlining_id) {}
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8