[turbofan] Drop the obsolete TypeGuard operator.

src/compiler/escape-analysis.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/compiler/escape-analysis.h"
 
 #include <limits>
 
 #include "src/base/flags.h"
 #include "src/bootstrapper.h"
@@ skipping 775 matching lines @@
         break;
       case IrOpcode::kObjectIsSmi:
         if (!IsAllocation(rep) && SetEscaped(rep)) {
           TRACE("Setting #%d (%s) to escaped because of use by #%d (%s)\n",
                 rep->id(), rep->op()->mnemonic(), use->id(),
                 use->op()->mnemonic());
           return true;
         }
         break;
       case IrOpcode::kSelect:
-      case IrOpcode::kTypeGuard:
       // TODO(mstarzinger): The following list of operators will eventually be
       // handled by the EscapeAnalysisReducer (similar to ObjectIsSmi).
       case IrOpcode::kObjectIsCallable:
       case IrOpcode::kObjectIsNumber:
       case IrOpcode::kObjectIsString:
       case IrOpcode::kObjectIsUndetectable:
         if (SetEscaped(rep)) {
           TRACE("Setting #%d (%s) to escaped because of use by #%d (%s)\n",
                 rep->id(), rep->op()->mnemonic(), use->id(),
                 use->op()->mnemonic());
@@ skipping 799 matching lines @@
     }
   }
   return false;
 }
 
 Graph* EscapeAnalysis::graph() const { return status_analysis_->graph(); }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8