Revert of [crankshaft] Fixing ES6 tail call elimination.

src/crankshaft/hydrogen.h

Index: src/crankshaft/hydrogen.h
diff --git a/src/crankshaft/hydrogen.h b/src/crankshaft/hydrogen.h
index 58bcc69cffd1c595e49f3c23b9b9af563c9c51e7..ca54a67932fa8f1cfd05aafa24027a5fda8b220a 100644
--- a/src/crankshaft/hydrogen.h
+++ b/src/crankshaft/hydrogen.h
@@ -2837,19 +2837,16 @@
                              Handle<Map> receiver_map);
 
   HInstruction* NewCallFunction(HValue* function, int argument_count,
-                                TailCallMode syntactic_tail_call_mode,
                                 ConvertReceiverMode convert_mode,
                                 TailCallMode tail_call_mode);
 
   HInstruction* NewCallFunctionViaIC(HValue* function, int argument_count,
-                                     TailCallMode syntactic_tail_call_mode,
                                      ConvertReceiverMode convert_mode,
                                      TailCallMode tail_call_mode,
                                      FeedbackVectorSlot slot);
 
   HInstruction* NewCallConstantFunction(Handle<JSFunction> target,
                                         int argument_count,
-                                        TailCallMode syntactic_tail_call_mode,
                                         TailCallMode tail_call_mode);
 
   bool CanBeFunctionApplyArguments(Call* expr);