[Interpreter] Optimize BytecodeArrayBuilder and BytecodeArrayWriter.

src/interpreter/bytecode-array-writer.h

 // 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.
 
 #ifndef V8_INTERPRETER_BYTECODE_ARRAY_WRITER_H_
 #define V8_INTERPRETER_BYTECODE_ARRAY_WRITER_H_
 
 #include "src/interpreter/bytecode-pipeline.h"
 #include "src/source-position-table.h"
 
@@ skipping 15 matching lines @@
       Zone* zone, ConstantArrayBuilder* constant_array_builder,
       SourcePositionTableBuilder::RecordingMode source_position_mode);
   virtual ~BytecodeArrayWriter();
 
   // BytecodePipelineStage interface.
   void Write(BytecodeNode* node) override;
   void WriteJump(BytecodeNode* node, BytecodeLabel* label) override;
   void BindLabel(BytecodeLabel* label) override;
   void BindLabel(const BytecodeLabel& target, BytecodeLabel* label) override;
   Handle<BytecodeArray> ToBytecodeArray(
-      Isolate* isolate, int fixed_register_count, int parameter_count,
+      Isolate* isolate, int register_count, int parameter_count,
       Handle<FixedArray> handler_table) override;
 
  private:
   // Maximum sized packed bytecode is comprised of a prefix bytecode,
   // plus the actual bytecode, plus the maximum number of operands times
   // the maximum operand size.
   static const size_t kMaxSizeOfPackedBytecode =
       2 * sizeof(Bytecode) +
       Bytecodes::kMaxOperands * static_cast<size_t>(OperandSize::kLast);
 
@@ skipping 15 matching lines @@
   void EmitJump(BytecodeNode* node, BytecodeLabel* label);
   void UpdateSourcePositionTable(const BytecodeNode* const node);
 
   ZoneVector<uint8_t>* bytecodes() { return &bytecodes_; }
   SourcePositionTableBuilder* source_position_table_builder() {
     return &source_position_table_builder_;
   }
   ConstantArrayBuilder* constant_array_builder() {
     return constant_array_builder_;
   }
-  int max_register_count() { return max_register_count_; }
 
   ZoneVector<uint8_t> bytecodes_;
-  int max_register_count_;
   int unbound_jumps_;
   SourcePositionTableBuilder source_position_table_builder_;
   ConstantArrayBuilder* constant_array_builder_;
 
   friend class BytecodeArrayWriterUnittest;
   DISALLOW_COPY_AND_ASSIGN(BytecodeArrayWriter);
 };
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODE_ARRAY_WRITER_H_