[interpreter] Introduce fused bytecodes for common sequences.

src/interpreter/bytecode-pipeline.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_PIPELINE_H_
 #define V8_INTERPRETER_BYTECODE_PIPELINE_H_
 
 #include "src/interpreter/bytecode-register-allocator.h"
 #include "src/interpreter/bytecodes.h"
 #include "src/zone-containers.h"
@@ skipping 82 matching lines @@
 
   // Clone |other|.
   void Clone(const BytecodeNode* const other);
 
   // Print to stream |os|.
   void Print(std::ostream& os) const;
 
   // Return the size when this node is serialized to a bytecode array.
   size_t Size() const;
 
+  // Transform to a node representing |new_bytecode| which has one
+  // operand more than the current bytecode.
+  void Transform(Bytecode new_bytecode, uint32_t extra_operand,
+                 OperandScale extra_operand_scale);
+
   Bytecode bytecode() const { return bytecode_; }
 
   uint32_t operand(int i) const {
     DCHECK_LT(i, operand_count());
     return operands_[i];
   }
   uint32_t* operands() { return operands_; }
   const uint32_t* operands() const { return operands_; }
 
   int operand_count() const { return Bytecodes::NumberOfOperands(bytecode_); }
@@ skipping 16 matching lines @@
 };
 
 std::ostream& operator<<(std::ostream& os, const BytecodeSourceInfo& info);
 std::ostream& operator<<(std::ostream& os, const BytecodeNode& node);
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODE_PIPELINE_H_