[turbofan] Kill type Guard nodes during effect/control linearization.

src/compiler/instruction-selector.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/instruction-selector.h"
 
 #include <limits>
 
 #include "src/base/adapters.h"
 #include "src/compiler/instruction-selector-impl.h"
@@ skipping 840 matching lines @@
     case IrOpcode::kEffectPhi:
     case IrOpcode::kMerge:
     case IrOpcode::kTerminate:
     case IrOpcode::kBeginRegion:
       // No code needed for these graph artifacts.
       return;
     case IrOpcode::kIfException:
       return MarkAsReference(node), VisitIfException(node);
     case IrOpcode::kFinishRegion:
       return MarkAsReference(node), VisitFinishRegion(node);
-    case IrOpcode::kGuard:
-      return MarkAsReference(node), VisitGuard(node);
     case IrOpcode::kParameter: {
       MachineType type =
           linkage()->GetParameterType(ParameterIndexOf(node->op()));
       MarkAsRepresentation(type.representation(), node);
       return VisitParameter(node);
     }
     case IrOpcode::kOsrValue:
       return MarkAsReference(node), VisitOsrValue(node);
     case IrOpcode::kPhi: {
       MachineRepresentation rep = PhiRepresentationOf(node->op());
@@ skipping 564 matching lines @@
 void InstructionSelector::VisitWord32PairSar(Node* node) { UNIMPLEMENTED(); }
 #endif  // V8_TARGET_ARCH_64_BIT
 
 void InstructionSelector::VisitFinishRegion(Node* node) {
   OperandGenerator g(this);
   Node* value = node->InputAt(0);
   Emit(kArchNop, g.DefineSameAsFirst(node), g.Use(value));
 }
 
 
-void InstructionSelector::VisitGuard(Node* node) {
-  OperandGenerator g(this);
-  Node* value = node->InputAt(0);
-  Emit(kArchNop, g.DefineSameAsFirst(node), g.Use(value));
-}
-
-
 void InstructionSelector::VisitParameter(Node* node) {
   OperandGenerator g(this);
   int index = ParameterIndexOf(node->op());
   InstructionOperand op =
       linkage()->ParameterHasSecondaryLocation(index)
           ? g.DefineAsDualLocation(
                 node, linkage()->GetParameterLocation(index),
                 linkage()->GetParameterSecondaryLocation(index))
           : g.DefineAsLocation(
                 node, linkage()->GetParameterLocation(index),
@@ skipping 356 matching lines @@
   return new (instruction_zone()) FrameStateDescriptor(
       instruction_zone(), state_info.type(), state_info.bailout_id(),
       state_info.state_combine(), parameters, locals, stack,
       state_info.shared_info(), outer_state);
 }
 
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8