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

src/compiler/instruction-selector.h

Index: src/compiler/instruction-selector.h
diff --git a/src/compiler/instruction-selector.h b/src/compiler/instruction-selector.h
index 2027e907bb4af09353665b14c80258a76e3a3288..9c1cd4ca0c0736c6deec3931263ae1fb53b3c57e 100644
--- a/src/compiler/instruction-selector.h
+++ b/src/compiler/instruction-selector.h
@@ -224,6 +224,7 @@ class InstructionSelector final {
   void InitializeCallBuffer(Node* call, CallBuffer* buffer,
                             CallBufferFlags flags, int stack_param_delta = 0);
   bool IsTailCallAddressImmediate();
+  int GetTempsCountForTailCallFromJSFunction();
 
   FrameStateDescriptor* GetFrameStateDescriptor(Node* node);