Revert of [crankshaft] Fixing ES6 tail call elimination.

src/crankshaft/hydrogen.h

 // Copyright 2012 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_CRANKSHAFT_HYDROGEN_H_
 #define V8_CRANKSHAFT_HYDROGEN_H_
 
 #include "src/accessors.h"
 #include "src/allocation.h"
 #include "src/ast/ast.h"
@@ skipping 2819 matching lines @@
 
   void BuildEmitFixedArray(Handle<FixedArrayBase> elements,
                            ElementsKind kind,
                            HValue* object_elements,
                            AllocationSiteUsageContext* site_context);
 
   void AddCheckPrototypeMaps(Handle<JSObject> holder,
                              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);
 
   // The translation state of the currently-being-translated function.
   FunctionState* function_state_;
 
   // The base of the function state stack.
   FunctionState initial_function_state_;
 
@@ skipping 197 matching lines @@
   }
 
  private:
   HOptimizedGraphBuilder* builder_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CRANKSHAFT_HYDROGEN_H_