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

src/compiler/instruction-selector.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_INSTRUCTION_SELECTOR_H_
 #define V8_COMPILER_INSTRUCTION_SELECTOR_H_
 
 #include <map>
 
 #include "src/compiler/common-operator.h"
@@ skipping 206 matching lines @@
   typedef base::Flags<CallBufferFlag> CallBufferFlags;
 
   // Initialize the call buffer with the InstructionOperands, nodes, etc,
   // corresponding
   // to the inputs and outputs of the call.
   // {call_code_immediate} to generate immediate operands to calls of code.
   // {call_address_immediate} to generate immediate operands to address calls.
   void InitializeCallBuffer(Node* call, CallBuffer* buffer,
                             CallBufferFlags flags, int stack_param_delta = 0);
   bool IsTailCallAddressImmediate();
+  int GetTempsCountForTailCallFromJSFunction();
 
   FrameStateDescriptor* GetFrameStateDescriptor(Node* node);
 
   // ===========================================================================
   // ============= Architecture-specific graph covering methods. ===============
   // ===========================================================================
 
   // Visit nodes in the given block and generate code.
   void VisitBlock(BasicBlock* block);
 
@@ skipping 55 matching lines @@
   IntVector virtual_registers_;
   InstructionScheduler* scheduler_;
   Frame* frame_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_INSTRUCTION_SELECTOR_H_