[interpreter] Faster and fewer flushes in register optimizer.

src/interpreter/bytecode-register-optimizer.h

 // Copyright 2016 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_INTERPRETER_BYTECODE_REGISTER_OPTIMIZER_H_
 #define V8_INTERPRETER_BYTECODE_REGISTER_OPTIMIZER_H_
 
 #include "src/interpreter/bytecode-pipeline.h"
 
 namespace v8 {
@@ skipping 75 matching lines @@
                                           const uint32_t* operands,
                                           int operand_count);
   static Register GetRegisterOutputOperand(int index, Bytecode bytecode,
                                            const uint32_t* operands,
                                            int operand_count);
 
   void CreateMaterializedEquivalent(RegisterInfo* info);
   RegisterInfo* GetMaterializedEquivalent(RegisterInfo* info);
   RegisterInfo* GetMaterializedEquivalentNotAccumulator(RegisterInfo* info);
   void Materialize(RegisterInfo* info);
+  void AddToEquivalenceSet(RegisterInfo* set_member,
+                           RegisterInfo* non_set_member);
 
   // Methods for finding and creating metadata for each register.
   RegisterInfo* GetOrCreateRegisterInfo(Register reg);
   RegisterInfo* GetRegisterInfo(Register reg);
   RegisterInfo* NewRegisterInfo(Register reg);
   void GrowRegisterMap(Register reg);
 
   bool RegisterIsTemporary(Register reg) const {
     return reg >= temporary_base_;
   }
@@ skipping 27 matching lines @@
   const Register temporary_base_;
 
   // Direct mapping to register info.
   ZoneVector<RegisterInfo*> register_info_table_;
   int register_info_table_offset_;
 
   // Counter for equivalence sets identifiers.
   int equivalence_id_;
 
   BytecodePipelineStage* next_stage_;
-  bool flushed_;
+  bool flush_required_;
   Zone* zone_;
 
   DISALLOW_COPY_AND_ASSIGN(BytecodeRegisterOptimizer);
 };
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODE_REGISTER_OPTIMIZER_H_