[turbofan] Turn common Guard operator into simplified TypeGuard.

src/compiler/effect-control-linearizer.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/effect-control-linearizer.h"
 
 #include "src/code-factory.h"
 #include "src/compiler/access-builder.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/linkage.h"
@@ skipping 333 matching lines @@
       // Schedule the call's IfSuccess node (if there is no exception use).
       TryScheduleCallIfSuccess(node, control);
     }
   }
 }
 
 bool EffectControlLinearizer::TryWireInStateEffect(Node* node, Node** effect,
                                                    Node** control) {
   ValueEffectControl state(nullptr, nullptr, nullptr);
   switch (node->opcode()) {
-    case IrOpcode::kGuard:
-      state = LowerGuard(node, *effect, *control);
+    case IrOpcode::kTypeGuard:
+      state = LowerTypeGuard(node, *effect, *control);
       break;
     case IrOpcode::kChangeBitToTagged:
       state = LowerChangeBitToTagged(node, *effect, *control);
       break;
     case IrOpcode::kChangeInt31ToTaggedSigned:
       state = LowerChangeInt31ToTaggedSigned(node, *effect, *control);
       break;
     case IrOpcode::kChangeInt32ToTagged:
       state = LowerChangeInt32ToTagged(node, *effect, *control);
       break;
@@ skipping 41 matching lines @@
       break;
     default:
       return false;
   }
   NodeProperties::ReplaceUses(node, state.value);
   *effect = state.effect;
   *control = state.control;
   return true;
 }
 
-EffectControlLinearizer::ValueEffectControl EffectControlLinearizer::LowerGuard(
-    Node* node, Node* effect, Node* control) {
+EffectControlLinearizer::ValueEffectControl
+EffectControlLinearizer::LowerTypeGuard(Node* node, Node* effect,
+                                        Node* control) {
   Node* value = node->InputAt(0);
   return ValueEffectControl(value, effect, control);
 }
 
 EffectControlLinearizer::ValueEffectControl
 EffectControlLinearizer::LowerChangeFloat64ToTagged(Node* node, Node* effect,
                                                     Node* control) {
   Node* value = node->InputAt(0);
 
   Node* value32 = graph()->NewNode(machine()->RoundFloat64ToInt32(), value);
@@ skipping 544 matching lines @@
   return jsgraph()->Int32Constant(Smi::kMaxValue);
 }
 
 Node* EffectControlLinearizer::SmiShiftBitsConstant() {
   return jsgraph()->IntPtrConstant(kSmiShiftSize + kSmiTagSize);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8