Refactor BasicBlock, no inheritance from GenericNode

src/compiler/scheduler.h

 // Copyright 2013 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.
 
 #ifndef V8_COMPILER_SCHEDULER_H_
 #define V8_COMPILER_SCHEDULER_H_
 
 #include "src/v8.h"
 
 #include "src/compiler/opcodes.h"
@@ skipping 48 matching lines @@
   SchedulerData* GetData(Node* node) {
     DCHECK(node->id() < static_cast<int>(node_data_.size()));
     return &node_data_[node->id()];
   }
 
   void BuildCFG();
 
   Placement GetPlacement(Node* node);
 
   int GetRPONumber(BasicBlock* block) {
-    DCHECK(block->rpo_number_ >= 0 &&
-           block->rpo_number_ < static_cast<int>(schedule_->rpo_order_.size()));
-    DCHECK(schedule_->rpo_order_[block->rpo_number_] == block);
-    return block->rpo_number_;
+    DCHECK(block->rpo_number() >= 0 &&
+           block->rpo_number() <
+               static_cast<int>(schedule_->rpo_order_.size()));
+    DCHECK(schedule_->rpo_order_[block->rpo_number()] == block);
+    return block->rpo_number();
   }
 
   void GenerateImmediateDominatorTree();
   BasicBlock* GetCommonDominator(BasicBlock* b1, BasicBlock* b2);
 
   friend class CFGBuilder;
 
   friend class ScheduleEarlyNodeVisitor;
   void ScheduleEarly();
 
   friend class PrepareUsesVisitor;
   void PrepareUses();
 
   friend class ScheduleLateNodeVisitor;
   void ScheduleLate();
 
   bool ConnectFloatingControl();
 
   void ConnectFloatingControlSubgraph(BasicBlock* block, Node* node);
 };
 }
 }
 }  // namespace v8::internal::compiler
 
 #endif  // V8_COMPILER_SCHEDULER_H_