[turbofan] Further fixing ES6 tail call elimination in Turbofan.

src/compiler/code-generator.h

 // 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.
 
 #ifndef V8_COMPILER_CODE_GENERATOR_H_
 #define V8_COMPILER_CODE_GENERATOR_H_
 
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/instruction.h"
 #include "src/deoptimizer.h"
@@ skipping 98 matching lines @@
   // Generates an architecture-specific, descriptor-specific return sequence
   // to tear down a stack frame.
   void AssembleReturn();
 
   // Generates code to deconstruct a the caller's frame, including arguments.
   void AssembleDeconstructActivationRecord(int stack_param_delta);
 
   // Generates code to manipulate the stack in preparation for a tail call.
   void AssemblePrepareTailCall(int stack_param_delta);
 
+  // Generates code to pop current frame if it is an arguments adaptor frame.
+  void AssemblePopArgumentsAdaptorFrame(Register args_reg, Register scratch1,
+                                        Register scratch2, Register scratch3);
+
   // ===========================================================================
   // ============== Architecture-specific gap resolver methods. ================
   // ===========================================================================
 
   // Interface used by the gap resolver to emit moves and swaps.
   void AssembleMove(InstructionOperand* source,
                     InstructionOperand* destination) final;
   void AssembleSwap(InstructionOperand* source,
                     InstructionOperand* destination) final;
 
@@ skipping 94 matching lines @@
   JumpTable* jump_tables_;
   OutOfLineCode* ools_;
   int osr_pc_offset_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_CODE_GENERATOR_H