[turbofan] Implement tail calls with differing stack parameter counts

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 192 matching lines @@
   void VisitConstant(Node* node);
   void VisitCall(Node* call, BasicBlock* handler = nullptr);
   void VisitTailCall(Node* call);
   void VisitGoto(BasicBlock* target);
   void VisitBranch(Node* input, BasicBlock* tbranch, BasicBlock* fbranch);
   void VisitSwitch(Node* node, const SwitchInfo& sw);
   void VisitDeoptimize(Node* value);
   void VisitReturn(Node* value);
   void VisitThrow(Node* value);
 
+  bool EmitTailCallSetup(Node* call, CallBuffer* buffer,
+                         InstructionCode* opcode);
+
   // ===========================================================================
 
   Schedule* schedule() const { return schedule_; }
   Linkage* linkage() const { return linkage_; }
   InstructionSequence* sequence() const { return sequence_; }
   Zone* instruction_zone() const { return sequence()->zone(); }
   Zone* zone() const { return zone_; }
 
   // ===========================================================================
 
   Zone* const zone_;
   Linkage* const linkage_;
   InstructionSequence* const sequence_;
   SourcePositionTable* const source_positions_;
   SourcePositionMode const source_position_mode_;
   Features features_;
   Schedule* const schedule_;
   BasicBlock* current_block_;
   ZoneVector<Instruction*> instructions_;
   BoolVector defined_;
   BoolVector used_;
   IntVector virtual_registers_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_INSTRUCTION_SELECTOR_H_