[turbofan] Implement tail calls with differing stack parameter counts

src/compiler/code-generator.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_CODE_GENERATOR_H_
 #define V8_COMPILER_CODE_GENERATOR_H_
 
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/instruction.h"
 #include "src/deoptimizer.h"
@@ skipping 75 matching lines @@
   void AssembleDeoptimizerCall(int deoptimization_id,
                                Deoptimizer::BailoutType bailout_type);
 
   // Generates an architecture-specific, descriptor-specific prologue
   // to set up a stack frame.
   void AssemblePrologue();
   // Generates an architecture-specific, descriptor-specific return sequence
   // to tear down a stack frame.
   void AssembleReturn();
 
-  // Generates code to deconstruct a the caller's frame, including arguments.
-  void AssembleDeconstructActivationRecord();
+  // Generates code to deconstruct a the caller's frame and prepare for a tail
+  // call, including swizzling parameters passed through to the tail call.
+  void AssembleTailCallSetup(Instruction* instr);
 
   // ===========================================================================
   // ============== Architecture-specific gap resolver methods. ================
   // ===========================================================================
 
   // Interface used by the gap resolver to emit moves and swaps.
   void AssembleMove(InstructionOperand* source,
                     InstructionOperand* destination) final;
   void AssembleSwap(InstructionOperand* source,
                     InstructionOperand* destination) final;
@@ skipping 72 matching lines @@
   SafepointTableBuilder safepoints_;
   ZoneVector<HandlerInfo> handlers_;
   ZoneDeque<DeoptimizationState*> deoptimization_states_;
   ZoneDeque<Handle<Object>> deoptimization_literals_;
   size_t inlined_function_count_;
   TranslationBuffer translations_;
   int last_lazy_deopt_pc_;
   JumpTable* jump_tables_;
   OutOfLineCode* ools_;
   int osr_pc_offset_;
-  bool needs_frame_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_CODE_GENERATOR_H