[turbofan] Introduce node regions for protection from scheduling.

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 527 matching lines @@
     case IrOpcode::kBranch:
     case IrOpcode::kIfTrue:
     case IrOpcode::kIfFalse:
     case IrOpcode::kIfSuccess:
     case IrOpcode::kSwitch:
     case IrOpcode::kIfValue:
     case IrOpcode::kIfDefault:
     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::kFinish:
-      return MarkAsReference(node), VisitFinish(node);
+    case IrOpcode::kFinishRegion:
+      return MarkAsReference(node), VisitFinishRegion(node);
     case IrOpcode::kParameter: {
       MachineType type =
           linkage()->GetParameterType(ParameterIndexOf(node->op()));
       MarkAsRepresentation(type, node);
       return VisitParameter(node);
     }
     case IrOpcode::kOsrValue:
       return MarkAsReference(node), VisitOsrValue(node);
     case IrOpcode::kPhi: {
       MachineType type = OpParameter<MachineType>(node);
@@ skipping 354 matching lines @@
 }
 
 
 void InstructionSelector::VisitBitcastInt64ToFloat64(Node* node) {
   UNIMPLEMENTED();
 }
 
 #endif  // V8_TARGET_ARCH_32_BIT
 
 
-void InstructionSelector::VisitFinish(Node* node) {
+void InstructionSelector::VisitFinishRegion(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());
   Emit(kArchNop,
@@ skipping 209 matching lines @@
   for (StateValuesAccess::TypedNode input_node : StateValuesAccess(stack)) {
     inputs->push_back(OperandForDeopt(&g, input_node.node, kind));
     descriptor->SetType(value_index++, input_node.type);
   }
   DCHECK(value_index == descriptor->GetSize());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8