[turbofan] Make sure Operator is really immutable.

src/compiler/verifier.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/verifier.h"
 
 #include <deque>
 #include <queue>
 
 #include "src/compiler/generic-algorithm.h"
@@ skipping 156 matching lines @@
       break;
     case IrOpcode::kThrow:
       // TODO(rossberg): what are the constraints on these?
       break;
     case IrOpcode::kParameter: {
       // Parameters have the start node as inputs.
       CHECK_EQ(1, input_count);
       CHECK_EQ(IrOpcode::kStart,
                NodeProperties::GetValueInput(node, 0)->opcode());
       // Parameter has an input that produces enough values.
-      int index = static_cast<Operator1<int>*>(node->op())->parameter();
+      int index = OpParameter<int>(node);
       Node* input = NodeProperties::GetValueInput(node, 0);
       // Currently, parameter indices start at -1 instead of 0.
       CHECK_GT(OperatorProperties::GetValueOutputCount(input->op()), index + 1);
       break;
     }
     case IrOpcode::kInt32Constant:
     case IrOpcode::kInt64Constant:
     case IrOpcode::kFloat64Constant:
     case IrOpcode::kExternalConstant:
     case IrOpcode::kNumberConstant:
@@ skipping 18 matching lines @@
       break;
     }
     case IrOpcode::kFrameState:
       // TODO(jarin): what are the constraints on these?
       break;
     case IrOpcode::kCall:
       // TODO(rossberg): what are the constraints on these?
       break;
     case IrOpcode::kProjection: {
       // Projection has an input that produces enough values.
-      int index = static_cast<Operator1<int>*>(node->op())->parameter();
+      int index = OpParameter<int>(node);
       Node* input = NodeProperties::GetValueInput(node, 0);
       CHECK_GT(OperatorProperties::GetValueOutputCount(input->op()), index);
       break;
     }
     default:
       // TODO(rossberg): Check other node kinds.
       break;
   }
 
   if (from_start) {
@@ skipping 218 matching lines @@
     // Check inputs for all nodes in the block.
     for (size_t i = 0; i < block->nodes_.size(); i++) {
       Node* node = block->nodes_[i];
       CheckInputsDominate(schedule, block, node, static_cast<int>(i) - 1);
     }
   }
 }
 }
 }
 }  // namespace v8::internal::compiler